U.S. Department of the Interior 

U.S. Geological Survey

Hydrogeologic and Water-Quality Data for the 

East Management Unit of Dover Air Force Base, 

Kent County, Delaware, 1995-96

By Joseph E. Beman, Daniel J. Phelan, Joel E. Dysart, Martha L. Cashel and 

Vanessa C. Smith

Open-File Report 99-253

In cooperation with the

THE UNITED STATES AIR FORCE

Baltimore, Maryland 

October 1999
U.S. Department of the Interior

BRUCE BABBITT, SECRETARY

U.S. Geological Survey

Charles G. Groat, Director

The use of trade, product, or firm names in this report is for 

descriptive purposes only and does not imply endorsement 

by the U.S. Geological Survey.

United States Government Printing Office: 1999

For additional information contact:

District Chief

U.S. Geological Survey, WRD 

8987 Yellow Brick Road 

Baltimore, Maryland 21237

Copies of this report can be purchased from:

U.S. Geological Survey 

Branch of Information Services 

Box 25286 

Denver, CO 80225-0286
CONTENTS

Abstract ................................................................................................................................................... 1

Introduction.............................................................................................................................................^ 1

Purpose and scope........................................................................................................................... 3

Description of study area................................................................................................................ 3

Previous investigations.................................................................................................................... 5

Description of monitoring-well network ........................................................................................ 6

Previously drilled wells............................................................................................................ 6

Drainage-ditch piezometers...................................................................................................... 6

Cone-penetrometer wells.......................................................................................................... 7

Acknowledgments........................................................................................................................... 7

Hydrogeologic data................................................................................................................................... 8

Hydrologic data............................................................................................................................... 8

Geophysical data...............................................................................................................................8

Areal electro-magnetic conductivity survey ............................................................................ 8

Borehole geophysics ............................................................................................................. 11

Natural-gamma logs......................................................................................................... 11

Electro-magnetic conductivity logs................................................................................. 11

Down-hole camera logs .................................................................................................. 12

Water-quality data .................................................................................................................................. 12

Ground-water samples ................................................................................................................. 12

Sampling methods................................................................................................................. 12

Decontamination methods..................................................................................................... 15

Surface-water samples ................................................................................................................. 15

Evaluation of quality-assurance data...................................................................................................... 15

Organic analytes............................................................................................................................ 18

Volatile organic compounds ................................................................................................... 18

Methane.................................................................................................................................. 18

Inorganic analytes......................................................................................................................... 19

Major ions and metals............................................................................................................ 19

Hydrogen................................................................................................................................ 20

Field measurements................................................................................................................ 20

Summary of quality-assurance data evaluation ............................................................................ 20

Selected references................................................................................................................................. 21

Appendix: ................................................................................................................................................81

Graphs showing geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Delaware, for well:

DM101D and DM102D....................................................................................................................... 82

DM 104D and DM 105D........................................................................................................................83

DM 107D and DM 109D....................................................................................................................... 84

DM110D and DM113D....................................................................................................................... 85

DM117D and DM118D...................................................................................................................... 86

MW10 and MW11............................................................................................................................... 87

MW12 and MW19............................................................................................................................... 88
MW20 andMWSTD........................................................................................................................... 89

MW39D and MW40D......................................................................................................................... 90

MW42PandMW43D......................................................................................................................... 91

MW44DandMW61S.......................................................................................................................... 92

MW62DandMW206D....................................................................................................................... 93

MW207DandMW226D..................................................................................................................... 94

MW227D ................................................................

FIGURES

Figure 1. Map showing location of the natural-attenuation study area at Dover Air Force Base,

Kent County, Delaware......................................................................................................... 2

2. Map showing location of study sites, previously drilled wells, drainage-ditch

piezometers, and cone-penetrometer wells at the natural-attenuation study area,

Dover Air Force Base, Kent County, Delaware..................................................................... 4

3. Hydrograph showing daily mean water-level elevations at the natural-attenuation study 

area, Dover Air Force Base, Kent County, Delaware, from October 1995 through 

December 1996 in:

(a)wellsDMHOSandDMHOD........................................................................................... 9

(b) piezometers GS4S and GS4D, and Pipe Elm Branch ..................................................... 9

4. Map showing the location and site numbers of the areal electro-magnetic conductivity 

survey at the natural-attenuation study area, Dover Air Force Base, Kent County, 

Delaware, March 1996......................................................................................................... 10

5. Map showing the locations of wells and piezometers sampled during July-August 1995, 

May-July 1996, and August 1996 at the natural-attenuation study area, Dover Air Force 

Base, Kent County, Delaware................................................................................................. 13

6. Map showing the locations of surface-water sites sampled during 1995 and 1996 at the

natural-attenuation study area, Dover Air Force Base, Kent County, Delaware..................... 16

TABLES

Table 1. Well-construction data and types of geophysical logs available for monitoring

wells at the natural-attenuation study area, Dover Air Force Base, Kent County, 

Delaware............................................................................................................................... 24

2. Daily mean water-level elevations in wells DM110D and DM110S, piezometers 

GS4D and GS4S, and Pipe Elm Branch, Dover Air Force Base, Kent County, 

Delaware, October 1995 through December 1996.............................................................. 29

3. Measured ground- and surface-water level elevations at the natural-attenuation study 

area, Dover Air Force Base, Kent County, Delaware, July 1995 through 

September 1996.................................................................................................................... 34
4. Areal electro-magnetic conductivity survey data at the natural-attenuation

study area, Dover Air Force Base, Kent County, Delaware, March 1996 ............................ 38

5-6. Ground- and surface-water quality data at the natural-attenuation study area, Dover 

Air Force Base, Kent County, Delaware, July-August 1995, 

May-July 1996, and August 1996, for:

5. Inorganic constituents....................................................................................................... 42

6. Organic constituents and total dissolved carbon............................................................. 60

7. Sample and duplicate concentrations, and relative percent differences for four volatile

organic compounds at sites where concentrations exceeded the reporting limit, July 1995 

through July 1996, Dover Air Force Base, Kent County, Delaware.....................................78

8. Sample and duplicate concentrations, relative percent differences, and summary statistics 

for methane samples collected from July 1995 through July 1996, Dover Air Force 

Base, Kent County, Delaware .......................................................................................... 79

9. Sample and duplicate concentrations, relative percent differences, and summary 

statistics for hydrogen samples collected in August, 1996, Dover Air Force Base, 

Kent County, Delaware .......................................................................................................80
CONVERSION FACTORS, ABBREVIATIONS, AND VERTICAL DATUM

Multiply By To obtain

inch (in.)

foot (ft)

mile (mi)

acre

gallon

gallon per minute

(gal/min)

25.4

0.3048

1.609

4,047

3.785

0.06308

millimeter (mm)

meter (m)

kilometer (km)

square meter

liter

liter per second

Temperature is reported in degrees Celsius (°C), which can be converted to degrees Fahrenheit (°F) 

by using the following equation: °F=1.8(°C) +32.

Sea level: In this report, "sea level" refers to National Geodetic Vertical Datum of 1929 a geodetic datum derived from a general adjustment of the first-order level nets of the United States and Canada, 

formerly called Sea Level Datum of 1929.

Chemical concentration, specific conductance, and water temperature are reported in metric units. 

Aqueous chemical concentration is given in milligrams per liter (mg/L) or in micrograms per liter Qig/L). 

Milligrams per liter is a unit expressing the concentration of chemical constituents in solution as well as 

weight (milligrams) of solute per unit volume (liter) of water.

One thousand micrograms per liter is equivalent to one milligram per liter. For concentrations less 

than 7,000 mg/L, the numerical value is the same as for concentrations in parts per million. Hydrogen concentrations in samples are expressed in nanomoles per liter (nmol/L).

Specific conductance of water is expressed in microsiemens per centimeter at 25 degrees Celsius 

(jiS/cm), which is identical to micromhos per centimeter at 25 degrees Celsius, formerly used by the U.S. 

Geological Survey.

VI
HYDROGEOLOGIC AND WATER-QUALITY DATA FOR THE 

EAST MANAGEMENT UNIT OF DOVER AIR FORCE BASE, 

KENT COUNTY, DELAWARE, 1995-96

By Joseph E. Beman, Daniel J. Phelan, Joel E. Dysart, 

Martha L. Cashel, and Vanessa C. Smith

ABSTRACT

This report presents data collected by the U.S. Geological Survey from April 1995 through September 1996 as part of a project to assess ground- and surface-water contamination, and to determine if 

natural attenuation of organic contaminants is a feasible alternative to remediation at four sites in the East 

Management Unit of Dover Air Force Base, in Kent County, Delaware. Ground- and surface-water-level 

data, borehole and surface geophysical data, and ground- and surface-water quality data, and the techniques used to collect the data are presented. The water-level and water-quality sampling network for this 

project consisted of 11 drainage-ditch piezometers and 8 cone-penetrometer wells installed during the 

study, and 86 previously drilled wells. An evaluation of quality-assurance data showed that water-quality 

data were of good quality, there was no evidence of cross-contamination in any samples, and the data were 

reproducible and unbiased.

INTRODUCTION

Dover Air Force Base (DAFB) is located in Kent County, Delaware, approximately 3.5 mi southeast of the center of the City of Dover, Delaware (fig.l). DAFB began operation in 1941 at the site of the 

partially constructed Dover Municipal Airfield. The base was used for various purposes during and after 

World War II and was deactivated in 1946, only to be reactivated as Dover Air Force Base in 1950. Since 

then, DAFB has been supporting activities of the U.S. Air Force (USAF) Air Mobility Command.

In March 1989, DAFB was listed on the National Priorities List (NPL), which placed it under regulations described in the Comprehensive Environmental Response, Compensation, and Liability Act of 

1980 (CERCLA) that governs activities at hazardous waste sites. The U.S. Geological Survey (USGS) 

conducted an investigation in cooperation with the Environmental Flight of the USAF to evaluate whether 

or not natural attenuation is a feasible alternative to remediation at disposal sites located in the East Management Unit of DAFB. This investigation was conducted in response to previous investigations that had 

determined sources of contamination, and the presence of contaminants in the ground- and surface-water 

systems in the East Management Unit. This report presents the results of the data-collection effort for that 

project.
75°29'06' 75°2T20m

0 to 20 Kilometers

Dover Air Force Base

0 0 25 0 5 0 75 1 KILOMETERS

Figure 1. Location of the natural-attenuation study area at Dover Air Force Base, 

Kent County, Delaware.
Purpose and Scope

The purpose of this report is to present data collected by the USGS from April 1995 through September 1996 as part of the natural-attenuation (NA) project to determine if natural attenuation of contaminants is a feasible alternative to remediation at four sites in the Eastern Management Unit of DAFB. An 

interpretive administrative report is being prepared concurrent with this report by the USGS. Ground- and 

surface-water-level data, borehole and surface geophysical data, and ground- and surface-water quality 

data, and the techniques used to collect the data are presented.

Description of Study Area

The topography of DAFB is flat with little spatial variation. Naturally-occurring land-surface elevations range from sea level along the St. Jones River, to about 37 ft above sea level on the northwestern 

boundary of the base (fig. 1). The northwest-southeast runway has an elevation of about 28 ft above sea 

level, which is higher than most of the surrounding area. Land-surface elevations in the study area of the 

East Management Unit range from a high of about 45 ft atop landfill LF13, to about 3.5 ft where Pipe Elm 

Branch flows across the base boundary at Postles Corner Road (fig. 2). With the exception of the landfill 

LF13, and the small valley along Pipe Elm Branch, land-surface elevations in the study area range from 20 

to 25 ft above sea level.

Three major hydrologic units have been identified beneath the base. The units are, in descending 

order, (1) the unconfined aquifer chiefly sand units of the Columbia Group, (2) the Frederica and Cheswold confined aquifers of the Chesapeake Group, and (3) the sand units of the confined Piney Point and 

Magothy Formations (Leahy,1982).

Data for the NA project were collected from four sites in the northeastern portion of DAFB. The 

sites are: Fire Training area 3 (FT03), Landfill 15 (LF15), Waste Pit 14 (WP14), and Landfill 13 (LF13). 

The locations of these sites are shown in figure 2.

Site FT03 covers approximately 1.3 acres (fig. 2). The site was used for fire training from 1970 to 

1989. Fuels were ignited and extinguished as part of fire training exercises. Site FT03 was remediated in 

1992, currently has a clay cap, and is covered with grass and minor gravel (Dames and Moore, written 

commun., 1996).

Site LF15 is two former landfills located near the receiver station (fig. 2). The site was initially 

reported to be an area of less than 0.5 acre; however, personnel familiar with the site described it as much 

larger. During the 1960's, LF15 was reportedly used for disposal of general refuse and small quantities of 

industrial shop wastes. Reportedly, the disposal area was filled to a depth of approximately 8 ft. When disposal activities ceased at an unknown date, the site was covered with several feet of local soil and seeded 

with grass. Site LF15 is currently an open, grass-covered field (Dames and Moore, written comrnun., 

1996).

Site WP14 was used as a liquid waste-disposal trench. The site is located near the access road leading to the receiver station, and 200 ft to the west of LF15. An individual involved in the trench's construction stated that it was 15 ft wide by 100 ft long by 6 ft deep. The trench was used during the 1950's for the 

disposal of waste solvents, hydraulic fluids, waste oils, and other liquid wastes generated in shop operations. After disposal activities ceased at WP14, the trench was filled with 3 to 4 ft of local soil and seeded 

with grass (Dames and Moore, written commun., 1996).

Site LF13 is an active landfill located about 1,000 ft to the southeast of LF15. The site, which covers approximately 4 acres, is sparsely covered with small trees and underbrush, with a gravel road down the 

center. The landfill slopes upward to the east, with the eastern edge of the site ending abruptly at a 20-ft-
75°27'30" 75°27'

39°08' 

39°07'45" 

Base from Harland Bartholowmew and Associates, Inc. 750 

i

1500 Feet 

_i

187.5 375 Meters

Figure 2. Location of study sites, previously-drilled wells, drainage-ditch piezometers, 

and corre-penetrometer wells at the natural-attenuation study area, 

Dover Air Force Base, Kent County, Delaware. [Well numbers for previouslydrilled wells begin with DM or MW. Site numbers for drainage-ditch piezometers 

begin with GS, and well numbers of cone-penetrometer wells begin with GSCP.J
high ledge of debris and concrete. Site LF13 was used from the early to late 1960's for disposal of small 

quantities of general refuse and large quantities of construction rubble. At present, the site is partially covered with construction rubble such as concrete, metal scraps and cans (Dames and Moore, written commun., 1996).

Previous Investigations

All four study sites have undergone previous or concurrent investigations, including the North and 

East Management Units Remedial Investigation (RI) of 1993 (Dames and Moore, written commun., 1996). 

Other studies which were conducted at some or all of the four study sites are: Science Applications International Corporation (SAIC) (1986 and 1989), and Hazardous Waste Remedial Actions Program 

(HAZWRAP) (1990). The following paragraphs describe investigations which have taken place at each 

study site.

Two previous investigations were conducted at site FT03 by SAIC (1986 and 1989). The SAIC 

studies led to a focused feasibility study (FFS), and subsequent remedial oversight activities. Based on the 

FFS, a Record of Decision (ROD) was signed in September 1990. During the 1986 investigation, groundwater and surface-water samples were collected on and around the site upon discovering evidence of oil 

contamination along a bank adjacent to a drainage ditch north of the site. During the 1989 investigation, a 

soil gas survey was conducted to delineate concentrations of petroleum and hydrocarbons and to finalize 

the locations of new monitoring wells and auger borings. Soil and ground-water samples were collected to 

characterize ground water and to identify extent of contamination. During the 1993 study, existing monitoring wells were resampled and soil samples were collected. Ground-water samples were analyzed for 

volatile organic compounds (VOCs), semivolitile organic compounds (SVOCs), pesticides/polychlorinated 

biphenyl (PCBs), hardness, and total dissolved solids (TDS). Soil samples were analyzed for VOCs, 

SVOCs, metals, total petroleum hydrocarbons (TPH) and pesticides/PCBs (Dames and Moore, written 

commun., 1996).

Three previous investigations were conducted at site LF15 prior to the NA project: SAIC (1986 

and 1989), HAZWRAP, (1990). During the 1986 investigation, three monitoring wells were installed, and 

ground-water samples were collected from those wells. All ground water samples were analyzed for oil 

and grease, cyanide and phenols, total organic carbon (TOC) and total organic halogens (TOX). During the 

1989 investigation, geophysical and soil gas surveys were conducted and ground water, surface water, and 

sediment were sampled (SAIC, 1989). The third investigation (HAZWRAP, 1990) focused primarily on 

WP14, however, a soil gas survey and ground-water sampling conducted for this investigation are relevant 

to LF15. The soil gas survey overlapped with the western portion of LF15. During a concurrent investigation, two test pits were excavated and sampled, soil samples were collected, and all existing monitoring 

wells were resampled to delineate the extent of contamination at the sites (Dames and Moore, written commun., 1996).

Two previous investigations were conducted at site WP14: SAIC (1986), HAZWRAP (1990). 

During the 1986 investigation, four monitoring wells were installed, and ground water samples were collected from those wells. All ground-water samples were analyzed for oil and grease, cyanide, TOX, and 

TOC. The first ground water samples analyzed during the study were also analyzed for metals, and the 

second set of samples were also analyzed for VOCs. During the 1990 investigation, a soil gas survey was 

conducted to identify source areas, and soil samples were collected to determine soil quality. During a 

concurrent investigation, surface geophysical surveys were conducted to assess the possible presence of 

buried metal objects within suspected trench areas and to identify potential source areas. Soil samples 

were collected to test for contaminants in the soil. One monitoring well pair was installed downgradient of 

a trench and sampled to determine if the trench was a source of contaminants, and to delineate contaminants originating from other sources (Dames and Moore, written commun., 1996).
Two previous investigations were conducted at site LF13 by SAIC (1986 and 1989). During the 

1986 investigation, soil samples were collected from the edge of the landfill and analyzed for metals, oil 

and grease, TOX, total organic chloride, and TOC. During the 1989 study, surface electro-magnetic conductivity and ground-penetrating radar surveys were performed, and two well pairs were installed upgradient and two well pairs downgradient. Ground-water samples were collected from the new wells to 

determine if contaminants were introduced from LF13. During a concurrent investigation, 12 subsurface 

samples were collected from six soil borings drilled to evaluate soil conditions. Three additional monitoring well pairs were installed and sampled along with the existing wells. Surface-water and bottom-sediment samples were collected from areas north and east of LF13 to determine if activities at LF13 affected 

nearby surface water (Dames and Moore, written commun., 1996).

Description of Monitoring-Well Network

The water-level and water-quality sampling network for this project consisted of 11 drainage-ditch 

piezometers and 8 cone-penetrometer (CRT) wells installed by USGS personnel, and 86 previously drilled 

wells. The locations of all wells and piezometers in the monitoring-well network are shown in figure 2. 

Construction data for all wells and piezometers in the monitoring-well network are shown in table 1, 

located at the end of the report. Methods used for installing drainage-ditch piezometers and cone-penetrometer wells, and the numbering systems are described in the following sections.

Previously Drilled Wells

Fifty-four monitoring wells were installed during three previous studies 20 during HAZWRAP, 

(1990), and 34 by SAIC, (1986 and 1989). Thirty-two additional wells were installed during one concurrent investigation by Dames and Moore. All 86 of these wells were screened in the Columbia aquifer. The 

20 <veils drilled during the 1990 study by HAZWRAP were drilled using hollow-stem auger methods, and 

usec 2-in.-diameter polyvinyl chloride (PVC) well casings and screens (HAZWRAP, 1990). Of the 34 

wells drilled during the 1986 and 1989 studies by SAIC, 33 of the 34 wells were drilled using hollow-stem 

auger methods and used 2-in.-diameter PVC casings and screens, and the other well (MW42P) was drilled 

using the hydraulic mud rotary method, with a bentonite and water mixture for the drilling mud, and was 

cased and screened with 4-in.-diameter PVC. The lower two-thirds of the saturated interval in well 

MW42P was screened to allow for an aquifer test (SAIC, 1989).

The 32 wells drilled during the concurrent study by Dames and Moore have well numbers with the 

prefix 'DM', and were installed in compliance with the basewide remedial investigation/feasibility study 

(RI/FS) work plan (WP). Shallow and deep well nests were installed in the Columbia Formation with hollow stem augering techniques. Well numbers for the shallower wells end in "S", and well numbers for the 

deeper wells end in "D" (e.g. DM 117S and DM117D). All drilling equipment was steam cleaned prior to 

use and between each well boring. 2-in.-diameter PVC casing and screen (0.010 or 0.020 slot size) were 

installed through the augers. In deep wells, the lower 10 ft of the aquifer were screened. Shallow wells 

were installed such that 10-ft-long screens were positioned with 2 ft of screen above the water table 

(Dames and Moore, written commun., 1996).

Drainage-Ditch Piezometers

Eleven drainage-ditch piezometers were installed during the summer of 1995 at four sites in the 

NA study area. Three sites (GS1, GS2, and GS4) have shallow, medium and deep piezometers in a nest, 

and one site (GS3) has shallow and medium-depth piezometers (fig. 2). Piezometers GS1S, GS1M, and 

GS1D represent the shallow, medium, and deepest depth screened in the nest, respectively. Each piezometer is a 2-in.-diameter stainless-steel drive point and is screened at the bottom with 0.010-in.- slot size
screen. Screen lengths range from 0.5 to 3 ft (table 1). Piezometers were driven using a tripod-mounted 

slide hammer which was raised and lowered by a manually controlled cat-head.

Cone-Penetrometer Wells

During May 1996, eight wells were installed in the study area by USGS and Applied Research 

Associates, Inc. (ARA) personnel using a trailer-mounted cone-penetrometer (CPT) rig owned by the 

USAF. Two of the eight CPT wells failed and were replaced by the USGS in July 1996 using the same 

CPT rig. The CPT rig was manufactured by Vertek 1 , weighs 12,000 pounds, and can push with a force of 

30 tons when anchored. The CPT wells were installed by (1) anchoring the rig to the ground by means of 

four augers [ground anchors] and turnbuckles, (2) hydraulically pushing a 2.5-in-diameter steel drive point 

to the desired [or maximum] depth and removing it, and (3) pushing the 2-in. PVC well screen and casing 

with steel rods from behind the screen's drive point to the planned depth. The PVC screens and casings, 

and the steel drive points and rods were steam cleaned after work at each site. The well numbers for the 

CPT wells begin with the letters 'GSCP' (for Geological Survey Cone Penetrometer), followed by a site 

number, and the letters 'D', 'M', or 'S' indicating deep, medium, or shallow depth wells, respectively.

At two sites, GSCP-1 and -5, an experimental oxidation-reduction probe operated by ARA personnel was pushed to 40 and 42 ft, respectively, prior to pushing the 2.5-in.-diameter point. A probe that measures and records resistivity, pore pressure, sleeve stress, and tip stress was also operated by ARA 

personnel and was also pushed at sites GSCP-1, -4, -5, -6, -8, and -9. Techniques used to measure the data 

during the pushes are still experimental, therefore the data are not included in this report, but are on file at 

the Delaware USGS office.

Acknowledgments

The authors thank the following people whose contributions made this report possible. Charles

Mikula, Robert Wickso, Gregory Jackson, and Joanne Deramo of the 436th support group, Civil Engineering Squadron, Environmental Flight of the USAF at DAFB provided logistical support and background 

information essential to all data-collection efforts. Michael Apgar of the Delaware Department of Natural 

Resources and Environmental Control (DNREC) oversaw all USGS well-installation activities. Mark 

Winner, Daniel Rooney, Travis Ingraham and Sean Ricker of Applied Research Associates, Inc. (ARA) 

operated cone-penetrometer (CPT) equipment and installed CPT wells. The authors also thank Mark 

Knoll, site supervisor for ARA at DAFB, for logistical support during the CPT well installations.

The following USGS personnel assisted in essential aspects of the study. Francis Chapelle, Paul 

Bradley, and James Landmeyer of the South Carolina District collected oxidation-reduction data presented 

in this report. George Zynjuk coordinated installation of piezometers and access piers. Robert Rosman 

and William Daniels assisted in piezometer installations and down-hole camera logging. Lisa Olsen analyzed methane samples collected during the July-August 1995 and the May-July 1996 sampling efforts. 

Anthony Tallman and Elizabeth Marchand aided in the field data collection and logistical coordination 

between the Maryland and Delaware USGS offices, and Judy Tegeler assisted in map presentation work 

necessary to the completion of this report. The authors also thank Peggy R. Nemoff and Donald A. Storck 

for thorough colleague reviews of the report.

Use of brand names in this report is for identification purposes only and does not constitute endorsement by the 

U.S. Geological Survey.
HYDROGEOLOGIC DATA

Hydrologic and geophysical data collected during the USGS investigations in the study area from 

May 1995 through September 1996 are presented in this section.

Hydrologic Data

Continuous ground-water-level data were collected using analog to digital recorders (ADR's) that 

were installed on wells DM110S and DM110D at the LF13 site, and in piezometers GS4S and GS4D that 

were installed in the Pipe Elm Branch streambed near where the stream crosses the base boundary (fig. 2). 

A hydrograph showing daily mean ground-water elevations for wells DM110S and DM110D is shown in 

figure 3a.

An additional ADR was installed in October 1995 adjacent to piezometers GS4S, GS4M, and 

GS4D (fig. 2) to record the stream stage of Pipe Elm Branch. The stage data were used to determine the 

relation between stream stage and ground-water elevations. Discharge was not calculated from the stage 

data because the stream is affected by tides. A hydrograph showing ground-water elevations in piezometers GS4S and GS4D, and the elevation of the stream stage is shown in figure 3b. Daily mean water-level 

elevations for the four ground-water and one surface-water sites measured with the ADR's are shown in 

table 2 at the end of the report.

Synoptic ground-water-level measurements were made during July and December 1995, and during March, April, June, August, and September 1996. Additional water-level measurements were made 

during the July-August 1995 and May-July 1996 water-quality sampling periods. Periodic surface-water 

elevations were measured at streambed piezometers GS1, GS3, and GS4. Measured ground- and surfacewater elevations are shown in table 3.

Geophysical Data

Surface and borehole geophysical measurements were used during this study to help determine 

lithologic and water-quality changes in the unconfined Columbia aquifer in the study area. The following 

sections describe the methods and presentation of the data from those investigations.

Areal Electro-Magnetic Conductivity Survey

Areal electro-magnetic conductivity surveys were performed during March, 1996 at 126 sampling 

points throughout the study area. The Geonics EM-34 terrain conductivity meter was used to measure conductivity in the 20- and 10-meter vertical and horizontal dipole orientations. The instrument measures 

apparent conductivity in millimhos per meter. The sampling point locations and the point numbers are 

shown in figure 4. The conductivity values for each data point are shown in table 4. Instrument checks 

were performed each day before data collection began. The conductivity was measured for each coil orientation at site number 1 to verify that the instrument was working properly, and no problems with the calibration checks were found.

The depth of the investigation is dependent on the inter-coil spacing, the operating frequency, and 

the orientation of the coils. In general, when the coils are in the horizontal-dipole mode (coil oriented vertically), the instrument responds to earth materials from the surface to a depth of 0.75 times the coil spacing, and is most sensitive to the shallow subsurface layers. In the vertical-dipole mode, (coils oriented 

horizontally) the instrument responds to earth materials to a depth of 1.5 times the coil spacing and is most
(a)

22

20

18

Hi 16

LJJ

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LJJ 

LJJ

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LJJ 

ft

10

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i i i i i i i i i i r

DM110D 

DM11 OS

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1995

J____I_____I_____I_____I

J FMAMJ J ASOND

1996

(b)

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1995 1996

Figure 3. Hydrograph showing daily mean water-level elevations at the natural attenuation study 

area, Dover Air Force Base, Kent County, Delaware, from October 1995 through December 1996 

in:

(a) wells DM110S and DM110D.

(b) piezometers GS4S and GS4D, and Pipe Elm Branch
75°27'30" 75°2T

39°08'

39°07'45"

/ i-»Ai t

» A_iq 79 T .

^'8 8° 8f1 t .

» *~-17 no t

A "'- ' * *

*-16 83 T T A

> Q^indT^dfr^^tf^

Base from Harland Bartholowmew 

and Associates, Inc.

750 

I

1500 Feet

187.5

I 

375 Meters

Figure 4. Location and site numbers of the areal electro-magnetic conductivity survey 

at the natural-attenuation study area, Dover Air Force Base, Kent County, 

Delaware, March 1996.

io
sensitive to layers at 0.4 times that spacing. Near-surface layers have little effect on the instrument in this 

mode (Haeni, 1986).

Borehole Geophysics

Natural-gamma (gamma) and borehole electro-magnetic conductivity (EM) geophysical logs were 

obtained for 22 wells during March 1996 with a Mount Sopris portable MGX logging system. Gamma 

logs alone were run on an additional 5 wells during the same period. The type of logs run for each well are 

shown in table 1. The geophysical logs are shown in the Appendix at the end of the report.

Natural-gamma logs

Gamma logs measure the amount of naturally-occurring gamma radiation in boreholes or wells. 

Gamma logs are used to indicate lithologic changes. Sands and gravels are indicated when the counts per 

second (cps) are low (curve deflects to the left). Clays are indicated by higher cps (curve deflects to the 

right). Obtaining gamma logs in cased holes results in a slightly reduced amount of radiation that is measured at the probe, but has no effect on the interpretation of the logs unless multiple casing techniques are 

used to install the well, resulting in decreased readings as the tool enters each additional casing. No wells 

logged during this study have multiple casings

Electro-magnetic conductivity logs

Borehole EM logs measure the apparent conductivity (in millisiemens per meter [mS/m,]) or 

inversely, resistivity, (in ohm-meters) of formations in open holes or in wells with PVC casing, but cannot 

work in steel-cased wells. The EM logs in this report are displayed in units of conductivity. The EM log 

works in air or fluid-filled holes, and can be interpreted similarly to electrical resistivity logs that can only 

be run in open (uncased) boreholes. The EM logs in the Appendix are graphed with increasing values to 

the right, and the curve generally follows the same trend as the gamma log. Ground water with conductive 

contaminant plumes can be indicated when there is a significant increase in conductivity without a corresponding increase in cps on the gamma log.

Conductive metals near the well casing will cause the measurements to be anomalously high. 

Metal surface casings that protect each well from damage cause interference by increasing the measured 

conductivity as the EM tool approaches land surface. Other metal in the borehole or well will also cause 

anomalously high readings. Casing centralizers, made from metal, or rubber with metal clamps, will cause 

interference in the log. This type of interference was found on the following logs:

DM110D MW10 MW11 MW12 MW19 MW20.

Interference with metal was also found at the bottom of 11 wells. Measured EM conductivity increased on 

the logs in the bottom of these wells with no corresponding increase in specific conductance in water samples taken from the deeper screened interval, compared to the measured specific conductance in the corresponding shallower well. There were also no corresponding changes in lithology when the EM logs were 

compared to the gamma logs. The interference was most likely caused by the use of a "knock-out" plug in 

the bottom of the auger bit that kept drill cuttings from entering the auger flights during drilling. When the 

wells were installed inside the auger flights, the well casing pushed out the knock-out plug, leaving the 

plug in the hole and allowing the well to stay in position as the auger flights were removed. No records 

have been found to document what type of plugs if any were used. Logs from the following wells had an 

increase in conductivity values at the bottom of the well that did not correspond to any lithologic or waterquality changes:
DM110D DM117D DM118D MW10 MW11 

MW20D MW43D MW44D MW206D MW226D 

MW227D.

The gamma tool typically measures about 1.5 ft deeper than the EM tool because the measuring point of 

the gamma tool is about 0.5 ft above the bottom of the tool, whereas the measuring point of the EM tool is 

about 2 ft above the bottom of the tool.

Down-hole camera logs

In May 1996, 55 wells in the study area were inspected with a Laval down-hole camera system as 

part of a larger basewide long-term monitoring project by the USGS. Twenty-nine wells outside this study 

area, but on base property, also were inspected with the downhole camera. Two different cameras were 

used: (1) a camera that would fit down a minimum 2-in.-diameter well casing, and (2) a larger camera that 

could fit down a minimum 4-in.-diameter casing. The aperture and focus of the larger camera could be 

changed downhole during logging, while the aperture and focus of the smaller camera was fixed while in 

the well. The intensity of the light source was adjustable for both cameras during logging. Wells in the 

study area that were logged with the down-hole camera are noted on table 1. The videotapes of the well 

logging are on file at the Dover, Delaware office of the USGS.

Of the 55 wells inspected, the only well that exhibited any sign of damage was DM110D, which 

had a crack at a casing joint at a depth of 4 ft below the top of the steel protective casing, and just below 

land surface. There was no indication of any leakage into the well at the crack, and the crack is likely 

sealed by the concrete pad surrounding the well.

WATER-QUALITY DATA

Between July 1995 and August 1996, ground- and surface-water samples were collected in the 

study area to help determine if natural attenuation of contaminants is occurring. The following sections 

describe the field methods used to collect the samples, and the field methods used to determine concentrations of specific parameters. Ground- and surface-water quality samples collected during the July-August, 

1995 and May-July, 1996 samplings were sent to a laboratory certified by the U.S. Environmental Protection Agency contract laboratory program (CLP). Field parameters, samples collected for methane, ethane, 

and ethylene, and samples collected during August, 1996 were analyzed by USGS personnel. The data are 

summarized in tables 5-9 at the end of the report.

Ground-Water Samples

Ground-water samples were collected from 35 wells during July-August 1995, and from 37 wells 

in May and July 1996. Additionally, samples from 21 wells were collected in August 1996. The location 

of the wells and piezometers that were sampled are shown in figure 5. All samples were analyzed for inorganic constituents (major ions and metals) and organic contaminants. Selected wells were also sampled for 

dissolved inorganic carbon, methane, and hydrogen. Inorganic ground-water quality data are shown in 

table 5, and organic ground-water quality data are shown in table 6.

Sampling Methods

Ground-water samples obtained during July-August 1995 and May-July 1996 were collected using 

a submersible, stainless steel and Teflon, positive displacement pump with a Teflon discharge tube. Drain12
75°27'30" 75°27'

39008' 

39°07'45"

Base boundary

Streams and drainage 

ditches

/> Study site

GS4S.M.D Location of sampled well 

or piezometer 

GS4S (shallow depth) 

GS4M (medium depth) 

GS4D (deep depth)

GSCP3M.D-« 

GSCP4M-*

MW227S.D

Receiver station

»-MW41S.D 

MW40S.D

DM113S.D

MW226M.D

 -MW61S 

MW62S.D

DM101D

DM1090 

 -DM110S.D

Base from Hartand Bartholowmew and Associates, Inc. 750 

i

1500 Feet 

_I

187.5 375 Meters

Figure 5. Locations of wells and piezometers sampled during July-August 1995, 

May-July 1996, and August 1996 at the natural-attenuation study area, 

Dover Air Force Base, Kent County, Delaware.

I3
age-ditch piezometers and DM110S were sampled using a peristaltic pump with clear PVC laboratory 

grade tubing. The submersible pump was used for both purging and sampling each well. The pump was 

lowered to the top of the screened interval and the water was purged at a flow rate of 0.2 to 0.25 gal/min to 

prevent drawdown of the water column. Field parameters (specific conductance, dissolved oxygen, pH, 

and temperature) were monitored in a flow-through chamber during purging. The wells were sampled 

after field parameters had stabilized, and at least one well volume had been purged.

Ground-water samples that were sent to the laboratory for inorganic analyses were filtered through 

a high capacity, 0.45-micron in-line filter. Samples sent to the laboratory for volatile organic analyses were 

not filtered.

Alkalinity, dissolved iron (Fe +Fe ), and dissolved ferrous iron (Fe+2 ) concentrations were 

determined in the field from filtered sample water. The alkalinity (as CaCO3) was determined using an 

incremental titration. The (Fe+2+Fe+3 ) and Fe concentrations were determined by the colorimetric bipyridine method (Brown and others, 1970, p. 103) using a portable Hach spectrophotometer.

Hydrogen sulfide was also determined in the field using the colorimetric bipyridine method, and 

concentrations were usually determined from unfiltered samples. In the 1995 sampling, when some water 

samples were too turbid to determine using the spectrophotometer, the samples were then filtered. In the 

1996 sampling, no hydrogen sulfide samples were filtered. If the water was too turbid, then the hydrogen 

sulfide concentrations were not determined.

Ground-water samples collected during August 1996 were analyzed using different methods to 

determine hydrogen, methane, sulfide and dissolved inorganic carbon (DIG) concentrations, and field 

parameters. Methods for collecting those samples are described below.

Hydrogen (as H2) samples were collected by the bubble-strip method of Chapelle and McMahon 

(1991). A stream of water was pumped from the well through a gas-sampling bulb at a rate of about 600 

milliliters per minute. An injected bubble of nitrogen in the bulb asymptotically collected hydrogen and 

other slightly soluble gases until equilibrium was achieved. Once equilibrium was achieved, (less than 5 

percent change in 5 minutes, which occurred within 15 minutes), gas was extracted from the bulb with a 

syringe. Concentrations of H2 were measured with a gas chromatograph equipped with a Reduction Gas 

Detector (Trace Analytical, Menlo Park, California). H2 was separated from carbon monoxide and methane on a 0.5-m column Carbosieve II (Supelco, Inc.) column using nitrogen as the carrier gas. The detection limit for H2 in a gas phase using this method is approximately 0.01 microliters per liter.

All samples from August 1996 were collected using standard water-quality techniques (Skougstad 

and others, 1978; Wood, 1976). All August 1996 samples were collected with a Bennett compressed-gas 

powered piston-driven submersible pump. Unstable parameters such as pH, DIC, dissolved oxygen, sulfide, and dissolved H2 were measured in the field at the time of sample collection. Dissolved oxygen and 

sulfide were determined using colorimetric procedures. Dissolved oxygen was determined by Winkler 

titration. Samples for the determination of Fe were filtered through a 0.1-micron pore-size filter, and 

determined using the Ferrozine method with a Hach Colorimeter (Stookey, 1970). Nitrate and sulfate were 

separated in the laboratory by anion-exchange chromatography and quantified by conductivity detection. 

Methane and DIC samples were collected by using a syringe with an attached 0.2 micron pore-size filter to 

inject 5 milliliters of water into separate, sealed, septated vials. Samples were refrigerated to minimize 

microbial activity. Methane and DIC concentrations were quantified by thermal conductivity detection gas 

chromatography. Dissolved methane concentrations were calculated by using Henry's Law coefficients 

(Stumm and Morgan, 1981).

14
Decontamination Methods

The pump and discharge line were decontaminated between the sampling of each well to prevent 

cross contamination. The outside of the pump head and line were scrubbed with a scrub-brush in a solution 

of deionized (DI) water and non-phosphate detergent and rinsed with DI water. The inside of the pump 

head and line were decontaminated by cycling a solution of DI water and detergent through the entire system. The pump head was placed in a 5-liter glass graduated cylinder full of the detergent solution and 

operated while discharging into the same cylinder for approximately 3 minutes. A DI water rinse followed 

by operating the pump in a separate rinse cylinder until the remaining detergent was no longer evident in 

the discharge. A 3-liter volume of isopropyl alcohol was passed through the system by operating the pump 

in a glass cylinder containing the alcohol (the same cylinder which earlier contained detergent solution). A 

final rinse of approximately three gallons of organic free DI water was flushed through the system. With 

organic free blank DI water still in the line, the pump head was covered in ultra clean aluminum foil and 

the entire system (pump, line, reel, and discharge tube) was enclosed in a fresh plastic bag for transport to 

the next sample site.

Surface-Water Samples

Surface-water samples were collected from four sites where the drainage-ditch piezometers are 

located, and the site locations are shown in figure 6. All surface-water samples were analyzed for the same 

constituents as ground-water samples. Samples were taken during July-August 1995, and May-July 1996.

Samples for laboratory analysis and field analysis were collected with a peristaltic pump and dedicated clear PVC laboratory-grade tubing. One end of the tubing was placed near the middle of the stream 

or ditch at a depth of about half that of the stream, and the other end of the tubing discharged sample 

directly into the sample container. Streams or drainage ditches were generally less than 10 ft wide, less 

than 1 ft deep, and nearly stagnant or very slow moving. Field parameters were determined by placing 

meter probes directly into the stream or ditch. Decontamination procedures for the tubing used for surface-water samples were the same as the procedures described in the ground-water section. Inorganic surface-water quality data are shown along with the inorganic ground-water quality data in table 5. Organic 

surface-water quality data are shown along with the organic ground-water quality data in table 6.

EVALUATION OF QUALITY-ASSURANCE DATA

Assessment of the quality of the water-quality data is an important step in data interpretation. In 

this report, data quality is evaluated in relation to data measurement error shown by reproducibility and 

bias. The quality of data is acceptable when analyte concentrations are reasonably reproducible and unbiased.

Reproducibility of data measurements can be determined using duplicate and field-spiked 

ampules. Duplicate samples were used to estimate the relative percent difference (RPD) between two theoretically similar measurements, and were calculated as follows:

I(C1 - C2)l x 100 = relative percent difference, 

(Cl+C2)/2

where Cl is the concentration in the first sample, and C2 is the concentration in the duplicate sample. In 

this study, RPD values greater than 40 percent indicate data measurements of poor quality.

15
75°27'30' 75°27'

39°08'

39°07'45"

Streams and drainage 

ditches

Location of surface 

water site

Base from Harland Bartholowmew and Associates, Inc. 750 1500 Feet

187.5 375 Meters

Figure 6. Locations of surface-water sites sampled during 1995 and 1996 at the 

natural-attenuation study area, Dover Air Force Base, Kent County, 

Delaware.

16
Bias in data measurements can occur because of contamination from a variety of sources. Contamination may be introduced into water samples during the well installation, during the collection of samples, 

in transit from the field to the laboratory, and during analysis in the laboratory. A positive bias can be introduced in the measurement of one or more analytes as a result of contamination. Contamination bias can be 

assessed by the incorporation of blank samples into the sampling program. Sample water for the blanks in 

this study was organic-free de-ionized water that was commercially supplied.

Equipment blanks were used to assess equipment or sampling conditions that may result in sample 

contamination. Equipment blanks consisted of organic-free de-ionized water passed through sampling 

equipment which had been decontaminated in the field. Analysis of both inorganic and organic analytes 

were completed for these blanks.

Trip and ambient blanks were used to assess contamination of VOCs during the field collection 

and shipping process. Trip blanks were prepared by filling VOCs vials with organic-free de-ionized water, 

sealing the vials, and exposing the closed vials to field conditions, and then shipping the blanks to the laboratory for analysis of VOCs. Ambient blanks were prepared by exposing organic-free de-ionized water 

to ambient conditions at selected field sites, pouring the blank water into VOCs vials, and shipping to the 

laboratory for analysis of VOCs.

Contamination bias also can be determined by comparing the concentration of selected analytes to 

those in previous samples. Cross-contamination of samples is likely if samples with high concentrations of 

one or more analytes are chronologically followed by a series of samples that indicate a progressive decline 

in concentrations for those same analytes. In this study, checks on chronological analyses (date and time of 

collection) were used to determine if cross-contamination had occurred.

The quality-control samples shown in the following table were collected from ground- and surface-water sites during 1995-96. Data results for all constituents are listed in tables 5 and 6 of this report.

Site

type

Ground

water

Analyte group

Organ ics

VOCs

Methane

Duplicate

pairs

7

17

Equipment

15

Blanks

Trip

8

VOCs

Ambient

2

Surface 

water

Inorganics

Major ions and

metals 

Hydrogen

Organics

VOCs

Methane 

Inorganics

Major ions and 

metals

Hydrogen

7

15

15

17
Organic Analytes

Volatile Organic Compounds

Analyte measurements were generally reproducible for the VOCs. Estimates of measurement 

reproducibility for these analytes were limited because the duplicate sample pairs seldom contained measurable concentrations. Ground water from four wells and surface water from one site had measurements 

above the reporting limit. The RPD of a VOC measurement varies as little as 0 percent and up to 11 percent. The four VOC compounds detected in these samples are shown in Table 7.

The sites at which duplicate samples were measured reflect the reproducibility of data measurements only for those sites with low concentrations of VOCs; duplicate samples were not representative of 

those environmental sites with higher concentrations of VOCs. For example, 60 of 82 environmental samples analyzed for trichloroethene had concentrations less than 1.0 (J.g/L (table 6); but data for the other 22 

environmental samples ranged from 1.0 |J.g/L to 190 |lg/L. The median concentration for the 22 environmental samples was 30 |J.g/L.

VOC concentrations in blanks rarely exceeded the reporting limits. Concentrations measured in 

blanks collected with the submersible pump were less than 2.0 |ig/L for vinyl chloride and less than 1.0 

(J-g/L for other VOCs. However, concentrations above the reporting limits were measured in a blank collected with the peristaltic pump, equipment blank no. 16. The tubing used to collect this blank was discarded. The sequential data for samples collected for well DM110S, equipment blank no. 16, and 

equipment blank no. 17 are shown in the following table.

Sample

DM110S

Equipment

Blank No. 16

Equipment

Blank No. 17

Date

6/13/96

6/13/96

6/14/96

Pump type

Peristaltic

Peristaltic

Submersible

cis- 1,2-

Dichloroethene,

(ug/L)

1,400

24

<1.0

Chlorobenzene,

(ug/L)

61

2.4

<l.O

Vinyl

chloride,

(ug/L)

800

4.7

<2.0

Blank data indicate that there is no cross-contamination of VOCs during sampling. Evidence 

shows that the VOCs detected in equipment blank no. 16 was not transferred to subsequent environmental 

samples.

Methane

Analyte measurements were reproducible for a wide range of concentrations of methane. Estimates of measurement reproducibility for methane included data from 17 duplicate samples (table 8). The 

median relative percent difference (RPD) for the duplicate samples was about 5 percent and ranged from 1 

percent to 17 percent. Concentrations ranged from about 30 fig/L to about 11,000 fig/L; and the RPD for 

those samples was 7 percent and 5 percent, respectively.

18
Inorganic Analytes 

Major Ions and Metals

The major ions of dissolved calcium, magnesium, sodium, potassium, chloride, sulfate, nitrogen 

and phosphorus are in this analyte group. The metals include dissolved aluminum, antimony, arsenic, barium, cadmium, chromium, cobalt, iron (total and Fe ), lead, manganese, mercury, molybdenum, nickel, 

selenium, silver, thallium, vanadium, and zinc.

Analyte measurements were generally reproducible for the major ions and metals. Estimates of 

measurement reproducibility for these analytes were limited because the duplicate sample pairs often contained concentrations below the reporting limit for the constituent. A summary of measurement reproducibility for the 10 analytes in this group that had at least one duplicate pair with measurements above the 

reporting limit is shown in the following table.

Analyte

Calcium

Magnesium

Sodium

Potassium

Chloride

Sulfate

Nitrogen, ammonia, as N

Nitrate, as N

Iron (total)

Manganese

Zinc

Number of 

duplicate 

pairs, all

9

9

9

9

9

9

9

9

9

9

9

Number of 

duplicate pairs 

less than 

reporting limit

1

2

9

1

9

9

1

2

5

6

7

Relative percent difference

Maximum

1

2

7

0

2

2

0

1

12

11

35

Minimum

1

1

1

0

0

1

0

0

0

0

3

The RPDs ranged from 0 percent for zinc to 35 percent for several analytes. The RPD was greater 

than 10 percent for some samples with low concentrations. Zinc measured in duplicate samples ranged 

only from less than the reporting limit of 0.010 mg/L to 0.036 mg/L. The RPD for zinc ranged from 3 percent to 35 percent. Concentrations for iron at one surface-water site, GS4SW, were 0.24 mg/L and 0.27 

mg/L and the RPD was 12 percent. In other duplicate samples, the concentration of iron ranged from 0.19 

mg/L to 19 mg/L and the RPD for these samples ranged from 2 percent to 8 percent.

Concentrations of the major ions and metals in blanks only exceeded the reporting limits for a single analyte in 2 of 17 blanks. Chloride concentrations from equipment blanks nos. 5 and 16 were 0.62 and 

0.53 mg/L, respectively. All other measurements were less than the reporting limit of 0.50 mg/L.

19
Hydrogen

Analyte measurements were generally reproducible for a wide range of hydrogen concentrations. 

Concentrations ranged from about less than 1.0 nanomoles/L to 21 nanomoles/L (table 9). Estimates of 

measurement reproducibility for hydrogen included data from 17 duplicate samples. The median RPD for 

the duplicate samples was about 9 percent and ranged from 2 percent to 37 percent.

Field Measurements

Equipment blanks were not collected for measurement of specific conductance, pH, alkalinity, 

water temperature, dissolved oxygen, dissolved iron, and hydrogen sulfide. Replicate measurements of 

sample water were usually completed for two species of dissolved iron (total and Fe2+) and hydrogen sulfide; differences in the replicates was always less than 50 percent (data not shown). Dissolved-oxygen 

concentrations were determined by meter, but concentrations less than 0.5 mg/L were also determined by 

Winkler titration.

Summary of Quality-Assurance Data Evaluation

The following conclusion is based on an examination of the quality of ground- and surface-water 

data collected for this study: Data for volatile organic carbon compounds, methane, major ions, metals, 

and hydrogen are of good quality. All RPD values were less than 40 percent. The RPD ranged from 0 percent to 11 percent for VOC compounds, 1 percent to 17 percent for methane, 0 percent to 35 percent for 

major ions and metals, and from 2 percent to 37 percent for hydrogen.

There was no evidence of cross-contamination in any samples and the data were reproducible and 

unbiased.

20
SELECTED REFERENCES

Brown, Eugene, Skougstad, M.W., and Fishman, M.J., 1970, Methods for collection and analysis 

of water samples for dissolved minerals and gases: Techniques of Water-Resources 

Investigations of the U.S. Geological Survey, Book 5, Chapter Al, 160p.

Chapelle, F.H., and McMahon, P.B., 1991, Geochemistry of dissolved inorganic carbon in a coastal plain 

aquifer: 1. Sulfate from confining beds as an oxidant in microbial CO2 production, in Journal of 

Hydrology, 127:85-108

Dames and Moore, 1994, Area 6 Remedial investigation, Dover Air Force Base, Dover, Delaware, July,

1994: Prepared for the U.S. Department of the Air Force, Dover Air Force Base, 436 SPTF/CEV, v. 

I-IV, 610 p., plus 4 appendices.

Dames and Moore, in press (a), Remedial investigation, east and north management units, Dover Air Force 

Base, Dover, Delaware, Volumes I and II [variously paged]

____, in press (b), West management unit, remedial investigation, Dover Air Force Base, Dover, Delaware, Volumes I and II [variously paged]

Haeni P.P., 1986, The use of electromagnetic methods to delineate vertical and lateral lithologic changes in 

glacial aquifers: Proceedings of the Conference on Surface and Borehole Geophysical Methods 

and Ground Water Instrumentation, by The National Water Well Association, Denver, Co., October 

15-17, 1986, 26 p.

Hazardous Waste Remedial Actions Program (HAZWRAP), 1990, Installation restoration program, draft 

technical memorandum: Sampling and data results, sites T-01, SP-9, D-4, and DD-1, Dover Air 

Force Base, Delaware, submitted by E.C. Jordan and C.C. Johnson and Malhotra,, February, 1990.

Johnston, Richard H., 1973 Hydrology of the Columbia (Pleistocene) deposits of Delaware: An appraisal 

of a regional water-table aquifer: Delaware Geological Survey, Bulletin No. 14, 78 p.,

Leahy, Patrick P., 1976, Hydraulic characteristics of the Piney Point aquifer and overlying confining bed 

near Dover, Delaware: Delaware Geological Survey Report of Investigations No. 26, 24p.

____1982, Ground-water resources of the Piney Point and Cheswold aquifers in central Delaware as 

determined by a flow model: Delaware Geological Survey, Bulletin No. 16, 68 p.

Science Applications International Corporation (SAIC), 1986, United States Air Force installation restoration program Dover Air Force Base, Delaware, Phase II Stage 1 confirmation/quantification.

____ 1989, Installation restoration program-stage 2 draft final report, Dover Air Force Base, Delaware.

Skougstad, M.W., Fishman, M.J., Friedman, L.C., Erdmann, D.E., and Duncan, S.S., 1978,

Methods for analysis of inorganic substances in water and fluvial sediments: U.S. Geological Survey Open File Report 78-679, 159 p.

Stookey, L.L., 1970, FerroZine, a new spectrophotometric reagent for iron, in Analytical Chemistry, p. 

779-781.

21
SELECTED REFERENCES-Continued

Stumm, Werner, and Morgan, J.J., 1981, Aquatic Chemistry: John Wiley and Sons, New York, 780 p.

Sundstrum, R.W. and Pickett, T.E., 1968, The availability of ground water in Kent County, Delaware, with 

special reference to the Dover area, University of Delaware, Water Resources Center, Newark, 

Delaware, 123 p.

Vroblesky, D.A., and Chapelle, Francis H., 1994, Temporal and spatial changes of terminal electronaccepting processes in a petroleum hydrocarbon-contaminated aquifer and the significance for 

contaminant biodegradation, in Water Resources Research, American Geophysical Union, vol. 30, 

no. 5, pages 1561-1570, May 1994

Wood, W.W., 1976, Guidelines for collection and field analysis of ground-water samples for selected

unstable constituents, in U.S. Geological Survey Techniques of Water-Resources Investigations, 

Book 1, Chapter D2, 24 p.
Tables 1 through 9 follow

23
Table 1. Well-construction data and types of geophysical logs available for monitoring wells at the natural-attenuation stud

County, Delaware

[Coordinates are in North American datum of 1927 - Delaware state plane; elevation is in feet above and below (-) sea level; ft, feet; in., inch; wells are cased 

galvanized steel; or SS, Stainless steel. Available geophysical logs include Cam, downhole camera log; EM, electro-magnetic conductivity log or G, natural 

Well 

number

Date installed

Easting 

coordinate 

(ft)

Northing 

coordinate 

(ft)

Top of 

casing

Elevation

Ground 

surface

Top of 

screen

Screen 

length 

(ft)

Total 

depth, 

below 

land 

surface 

(ft)

Ty

PREVIOUSLY INSTALLED WELLS

DM02S

DMI01D

DMI01S

DMI02D

DM104D

DM104S

DM105D

DM105S

DM106D

DM106S

DM107D

DM107S

DM108D

DM108S

DM109D

DM109S

DM HOD

DM 1 1 OS

DM113D

DM113S

05-02-91

06-17-93

06-17-93

06-15-93

07-02-93

06-30-93

07-07-93

07-07-93

06-29-93

06-30-93

06-06-93

06-06-93

06-08-93

06-08-93

06-23-93

06-23-93

06-23-93

06-25-93

06-11-93

06-16-93

489069

490735

490740

491503

489371

489377

489418

489425

489430

489428

488957

488962

488709

488715

490939

490941

490219

490224

489466

489466

410065

411581

411577

410001

410579

410576

410971

410969

410154

410141

412656

412658

412848

412847

411295

411303

411211

411212

411967

411975

26.24

25.84

25.70

21.44

24.68

24.71

21.65

21.44

26.07

26.05

15.96

16.38

13.80

13.99

23.87

24.18

29.43

29.36

23.34

23.20

24.14

22.89

23.11

19.12

22.49

22.45

18.55

18.77

23.51

23.31

13.60

13.85

11.46

11.66

21.39

21.59

25.37

25.66

20.92

20.87

14.44

-20.11

16.92

-30.12

-47.43

15.13

-50.51

11.85

-48.85

15.93

-15.15

7.47

-11.33

4.75

-12.54

14.88

-38.00

15.33

-32.68

12.06

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

100

10.0

10.0

10.0

10.0

10.0

10.0

10.0

19.70

53.00

16.19

59.24

79.92

17.32

79.06

16.92

82.36

17.38

38.75

26.38

32.79

16.91

43.93

16.71

73.37

20.33

63.60

18.81

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV

PV
Table 1. Well-construction data and types of geophysical logs available for monitoring wells at the natural-attenuation stu

County, Delaware Continued

Well 

number

DM114D

DM 1 1 6D

DM116S

DMI17D

DM117S

DM1 18D

DM118S

DM119D

DM119S

DM121D

DM121S

DM206D

MW10

MW11

MW12

MW13

MW18

MW19

MW20

MW21

MW22

MW23

Date installed

08-24-93

08-18-93

08-18-93

08-18-93

08-23-93

08-19-93

08-19-93

08-20-93

08-20-93

08-25-93

08-25-93

08-20-93

10-25-84

10-26-84

10-29-84

10-26-84

10-24-84

10-24-84

10-25-84

10-29-84

10-30-84

10-30-84

Easting 

coordinate 

(ft)

489067

487395

487394

487785

487786

487883

487880

487822

487822

488598

488459

487584

489275

489330

489424

489441

487418

487600

487800

489591

489880

489935

Northing 

coordinate 

(ft)

410324

413598

413603

413472

413477

413720

413720

413838

413833

410304

410300

414135

411990

412156

412151

412076

412819

413144

413104

412488

412474

412284

Top of 

casing

PREVIOUSLY

26.51

19.70

20.02

16.95

16.52

16.42

16.55

17.27

15.72

25.05

24.86

19.68

22.38

21.76

21.81

22.97

19.73

16.27

12.34

18.03

20.19

21.39

Elevation

Ground 

surface

Top of 

screen

Screen 

length 

(ft)

Total 

depth, 

below 

land 

surface 

(ft)

INSTALLED WELLS-CONTINUED

24.45

17.89

17.62

14.77

14.59

13.31

13.68

15.54

14.66

22.25

22.25

16.59

19.40

19.75

19.74

20.36

18.13

14.42

10.39

16.06

18.23

19.44

-44.66

-18.97

12.33

-18.61

8.33

-18.34

6.50

-14.07

5.41

-36.55

17.29

-17.33

9.36

8.74

8.73

8.10

7.52

5.26

3.23

6.00

8.16

9.30

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

46.0

44.0

44.0

50.00

38.0

35.0

33.0

50.0

50.0

47.0

79.11

46.86

15.29

43.38

15.76

41.65

17.18

39.61

19.25

68.80

14.96

43.92

56.04

55.01

55.01

62.26

48.61

44.16

40.16

60.06

60.07

57.14
Table L Well-construction data and types of geophysical logs available for monitoring wells at the natural-attenuation stu

County, Delaware Continued

Well 

number

Date installed

Easting 

coordinate 

(ft)

Northing 

coordinate 

(ft)

Top of 

casing

Elevation

Ground 

surface

Top of 

screen

Screen 

length 

(ft)

Total 

depth, 

below 

land 

surface 

(ft)

PREVIOUSLY INSTALLED WELLS-CONTINUED

MW36D

MW37D

MW37S

MW38D

MW38S

MW39D

MW39S

MW40D

MW40S

MW41D

MW41S

MW42P

MW43D

MW43S

MW44D

MW44S

MW61D

MW61S

MW62D

MW62S

MW63D

MW63S

03-24-88

03-21-88

03-21-88

03-25-88

03-25-88

03-23-88

03-23-88

03-22-88

03-23-88

03-21-88

03-21-88

05-17-88

03-30-88

05-28-88

03-28-88

03-29-88

03-29-88

03-29-88

05-03-88

05-04-88

05-02-88

04-29-88

489701

489365

489363

489861

489865

489535

489537

489686

489681

489931

489925

489911

487775

487787

487310

487322

490150

490140

489860

489862

489751

489761

412604

412481

412490

412743

412733

412288

412279

412027

412031

412065

412055

412733

413230

413230

412982

412990

411683

411682

411628

411635

411274

411277

17.53

16.28

16.29

19.64

19.05

19.55

19.57

20.51

20.68

23.45

23.61

19.41

14.06

14.15

20.99

20.61

26.51

26.77

22.14

22.27

22.20

22.12

15.90

14.39

14.01

17.20

17.22

18.28

17.01

18.76

18.66

21.60

21.60

16.84

11.70

11.62

18.06

17.78

25.21

24.74

19.77

19.48

20.15

19.63

-34.11

-28.61

3.69

-34.96

-2.71

-34.70

7.41

-23.27

6.57

-36.55

8.60

-7.58

-3.31

-20.49

-26.93

5.85

-37.74

7.21

-42.94

4.49

-47.86

9.61

5.0

5.0

10.0

5.0

10.0

5.0

10.0

5.0

10.0

5.0

10.0

33.0

5.0

10.0

5.0

10.0

5.0

10.0

5.0

10.0

5.0

10.0

55.01

48.00

20.32

57.16

29.93

57.98

19.60

47.03

22.09

63.15

23.00

57.42

20.01

42.11

49.99

21.93

67.95

27.53

67.71

24.99

73.01

20.02
Table 1. Well-construction data and types of geophysical logs available for monitoring wells at the natural-attenuation stu

County, Delaware Continued

Well 

number

Date installed

Easting 

coordinate 

(ft)

Northing 

coordinate 

(ft)

Top of 

casing

PREVIOUSLY

MW64D

MW64S

MW206D

MW206M

MW207D

M\V207M

MW226D

MW226M

MW226S

MW227D

MW227M

MW227S

MWD4A

MWD4B

MWD4C

MWD4D

MWD4E

MWD4F

MWD4G

MWD4H

MWD4I

MWDD1F

03-25-88

03-25-88

03-15-88

04-23-88

04-22-88

04-22-88

03-24-89

04-04-89

04-04-89

03-23-89

04-03-89

04-04-89

03-10-88

03-08-88

03-09-88

03-10-88

03-01-89

02-28-89

02-28-89

03-01-89

03-01-89

03-11-88

490634

490626

489137

489097

488992

488986

489552

489558

489554

488960

488965

488969

488996

489126

489727

.489508

489374

488714

488931

489587

490408

487595

410825

410827

412452

412435

412045

412057

411777

411769

411774

412970

412973

412977

412055

412459

412614

411561

411580

412383

412891

412977

412896

414128

23.92

24.14

16.85

16.22

20.75

20.82

24.31

24.71

24.81

22.86

21.45

21.39

20.93

17.29

18.81

23.34

24.01

20.38

21.68

21.21

21.87

19.09

Elevation

Ground 

surface

Top of 

screen

Screen 

length 

(ft)

Total 

depth, 

below 

land 

surface 

(ft)

INSTALLED WELLS-CONTINUED

21.68

21.69

14.27

14.10

18.00

18.07

22.31

22.38

22.31

19.36

19.35

19.35

17.97

14.17

16.31

20.42

21.43

17.63

19.43

19.01

18.58

16.19

-37.48

-3.09

-20.05

-4.22

-19.48

-6.64

-44.99

-14.51

12.53

-16.85

-3.98

6.41

13.72

11.25

12.00

16.35

6.88

6.25

6.32

12.47

-0.45

10.39

5.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

3.0

3.0

3.0

3.0

3.0

10.0

64.16

34.78

44.32

28.32

47.48

34.71

77.30

46.89

19.78

46.21

33.33

22.94

14.25

12.92

14.31

14.07

17.55

14.38

16.11

9.54

22.03

15.80
Table L Well-construction data and types of geophysical logs available for monitoring wells at the natural-attenuation stu

County, Delaware Continued

Well 

number

GS1S

GS1M

GS1D

GS2S

GS2M

GS2D

GS3S

GS3M

GS4S

GS4M

GS4D

GSCP1

GSCP3D

GSCP3M

GSCP4M

GSCP5M

GSCP6D

GSCP8

GSCP9S

Date installed

07-12-95

07-02-95

07-12-95

07-19-95

07-18-95

07-19-95

07-20-95

07-21-95

07-31-95

08-02-95

07-31-95

07-02-96

05-15-96

05-15-96

05-17-%

05-06-96

05-23-96

07-02-96

05-10-96

Easting 

coordinate 

(ft)

489080

489080

489080

488938

488938

488938

487458

487458

487978

487978

487978

487694

488754

488752

488863

489178

489645

491065

489325

Northing 

coordinate 

(ft)

Top of 

casing

Elevation

Ground 

surface

WELLS INSTALLED BY THE U.S. 

412185 14.26 9.06

412185

412185

412341

412341

412341

413203

413203

413863

413863

413863

413506

413226

413224

413131

412731

413073

410697

412149

15.82

13.59

14.86

10.36

10.79

7.56

8.27

10.47

10.33

9.60

15.44

16.26

16.30

18.33

17.92

18.44

22.30

19.59

9.21

9.09

7.28

7.06

7.39

4.76

4.37

3.27

3.76

4.50

15.60

16.60

16.80

18.60

18.20

18.80

22.50

19.90

Top of 

screen

Screen 

length 

(ft)

GEOLOGICAL SURVEY 

6.16 0.5

-2.59

-12.21

2.28

-4.44

-12.71

-1.34

-7.33

-1.73

-5.24

-13.80

-5.40

-26.40

-2.20

-2.40

-8.80

-18.70

-7.50

-4.10

1.0

3.0

0.5

1.0

3.0

3.0

3.0

0.5

0.5

3.0

3.0

3.0

3.0

3.0

3.0

3.0

3.0

3.0

Total 

depth, 

below 

land 

surface 

(ft)

3.70

13.10

23.30

5.80

12.30

23.30

11.30

18.80

5.80

9.80

21.30

24.00

46.00

22.00

24.00

30.00

40.50

33.00

26.00
Table 2. Daily mean water-level elevations in wells DMIIOD and DM110S, piezometers GS4D and GS4S, and Pipe El

Kent County, Delaware, October 1995 through December 1996

-,data not available]

WELL DMIIOD STATION NUMBER390744075270402 LATITUDE 39°07'44" LONGITUDE 0

WELL DEPTH 74.0 FEET BELOW LAND SURFACE, GEOLOGIC UNIT: COLUMBIA AQU

GROUND - WATER LEVEL ELEVATIONS, IN FEET ABOVE SEA LEVEL, DAILY

DAY OCT

1 

2 

3 

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26 8.23

27 8.24

28 8.27

29 8.23

30 8.20

31 8.20

MEAN

MAX

MIN

8 

8 

8 

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

1995

NOV

.21 

.23 

.25 

.21

.19

.19

.25

.25

.19

.18

.25

.28

.28

.44

.54

.52

.57

.64

.68

.70

.78

.77

.77

.77

.80

.83

.86

.85

.84

.87

.51

.87

.18

DEC

8.95 

8.87 

8.91 

8.93

8.92

8.95

8.95

8.93

9.00

8.99

8.99

8.97

8.97

9 .03

9.04

 9.04

9.04

9.08

9.23

9.32

9.33

9.36

9.39

9.44

9.48

9.52

9.53

9.52

9.50

9.54

9.61

9.17

9.61

8.87

JAN

9.62 

9.66 

9.77 

9.65

9.

9.

9.

9.

9.

9.

9.

9.

9.

9.

9.

9.

10.

10.

10.

10.

10.

11.

11.

11.

11.

11.

11.

11.

11.

12.

12.

10.

12.

9.

66

69

91

95

84

84

80

97

98

94

93

93

07

14

60

69

96

13

31

52

34

34

68

69

83

01

07

50

07

62

11 

11 

11 

11

11

11

11

11

12

12

12

12

12

12

12

12

12

12

12

12

12

12

12

13

12

12

12

13

12

12

13

11

FEB

.92

.95 

.96 

.87

.80

.78

.81

.97

.14

.35

.69

.62

.55

.74

.59

.55

.54

.43

.24

.30

.52

.67

.83

.04

.98

.97

.94

.05

.76

- - -

.43

.05

.78

MAR

12.69 

12.77 

12.67 

12.45

12.65

14

14

14

14

14

15

15

14

14

14

14

14

. . -

13

13

13

13

APR

.26

.30

.35

.51

.92

.05

.07

.86

.70

.49

.72

.66

.58

.38

.41

.46

13 

13 

13 

13

13

13

13

13

14

14

14

14

14

14

14

14

14

14

14

14

13

13

13

13

13

13

13

13

13

13

13

13

14

13

MAY

.29 

.25

.19 

.19

.26

.49

.49

.84

.23

.54

.69

.69

.48

.33

.22

.21

.22

.14

.11

.03

.91

.73

.60

.51

.37

.30

.26

.21

.21

.21

.12

.75

.69

.12

1996

JUN

13.05 

13.00 

13.01 

13.02

12.96

12.89

12.88

12.85

12.75

12.70

12.68

12.68

. . .

. . .

14.49

14.32

14.15

14.07

MEAN

JUL AUG

. . .

12

12

12

12

12

12

12

12

12

12

12

12

11

11

11

.89

.81

.70

.62

.60

.54

.47

.41

.32

.24

.16

.06

.98

.90

.81

VALUE

SE

11.7

11.7

11.6

11.5

11.

11.

11.

U11.

11.

11.

11.

11.

11.

11.

10.

11.

11.

11.

11.

11.

11.

11.

10.

10.

10.

10.

10.

10.

10.

11.

11.

10.

4

4

4

3

2

2

1

1

1

0

0

9

1

1

0

0

0

0

0

9

9

8

8

9

9

8

1

7

8
Table 2. Daily mean water-level elevations in wells DM110D and DM110S, piezometers GS4D and GS4S, and Pipe El

Kent County, Delaware, October 1995 through D^ember 1996 Continued

WELLDM110S STATION NUMBER 390744075270401 LATITUDE 39°07'44" LONGITUDE 

WELL DEPTH 19.0 FEET BELOW T.A?!D SURFACE, GEOLOGIC UNIT: COLUMBIA AQU

GROUND -WATER LEVEL ELEVATIONS, IN FEET ABOVE

1995

DAY OCT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26 13.23

27 13.30

28 13.37

29 13.19

30 13.09

31 13.11

MEAN

MAX

MIN

NOV

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

13

14

14

14

14

13

.16

.30

.36

.22

.13

.19

.38

.36

.15

.11

.33

.31

.23

.51

.58

.40

.46

.60

.69

.74

.90

.89

.85

.84

.88

.97

.05

.04

.00

.05

.11

DEC

14.17

14.11

14.14

14.21

14.16

14.25

14.26

14.19

14.33

14.32

14.31

14.29

14.28

14.39

14.43

14.43

 14.40

14.48

14.71

14.82

14.77

14.78

14.79

14.85

14.90

14.95

14.96

14.93

14.88

14.92

15.04

14.53

15.04

14.11

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

16

15

16

16

16

17

16

16

17

17

17

18

18

16

18

15

JAN

.08

.14

.26

.11

.07

.13

.44

.54

.38

.38

.28

.57

.56

.49

.45

.46

.68

.80

.15

.94

.19

.39

.71

.15

.87

.93

.65

.49

.77

.25

.47

.09

.47

.07

FEE

18.

18.

18.

18.

18.

18.

18.

19.

19.

19.

19.

19.

19.

19.

19.

19.

19.

19.

19.

19.

19.

20.

20.

20.

20.

20.

20.

20.

20.

-

-

19.

20.

18.

24

39

53

42

37

45

71

18

34

27

74

58

45

92

74

78

83

68

38

61

94

12

27

51

36

36

38

65

20

53

65

24

MAR

20

20

20

19

20

20

20

20

20

19

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

19

.17

.42

.24

.93

.42

.68

.65

.56

.10

.93

.32

.78

.82

.82

.99

.67

.56

.59

.85

.89

.68

.48

.31

.12

.35

.30

.05

.29

.69

.61

.74

.48

.99

.93

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

21

20

20

20

20

20

20

20

20

20

20

20

20

20

20

20

21

20

APR

.92

.85

.82

.89

.77

.67

.83

.73

.89

.97

.92

.97

.87

.77

.64

.06

.76

.64

.77

.83

.71

.68

.88

.67

.69

.83

.42

.14

.37

.51

.75

.06

.14

MAY

20

20

20

20

20

20

20

20

20

20

21

20

20

20

20

20

20

20

20

20

20

20

20

19

19

19

19

19

19

19

19

20

21

19

.31

.34

.39

.47

.38

.49

.36

.68

.75

.90

.15

.95

.59

.43

.40

.64

.76

.74

.77

.68

.50

.20

.03

.90

.67

.60

.59

.67

.88

.92

.77

.35

.15

.59

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

20

20

20

20

19

19

19

19

19

19

19

20

19

SEA LEVEL, DAILY MEAN

1996

JUN

.64

.58

.72

.86

.80

.71

.73

.63

.37

.29

.31

.37

.73

.78

.65

.59

.57

.70

.14

.32

.31

.14

.96

.93

.59

.40

.25

.02

.07

. . .

.32

.02

JUL

19.24

19.39

19.50

19.22

18.82

18.66

18.56

18.49

18.26

17.79

17.48

17.51

18.05

18.04

18.23

18.32

18.41

18.48

18.81

18.66

18.42

18.27

18.24

18.06

17.92

17.86

17.56

17.39

17.37

17.36

17.38

18.25

19.50

17.36

AUG

17.38

 - -

19.45

19.46

19.33

19.22

19.20

19.11

18.95

18.84

18.63

18.48

18.32

18.13

17.98

17.84

17.68

VALUE

S

17.

17.

17.

17.

17.

17.

17.

16.

16.

16.

16.

16.

16.

16.

16.

16.

16.

16.

16.

16.

16.

16.

15.

15.

15.

15.

15.

15.

15.

15.

16.

17.

15.
Table 2. Daily mean water-level elevations in wells DM110D and DM110S, piezometers GS4D an d GS4S, and Pipe E

Kent County, Delaware, October 1995 through December 1996-Continued

WELLGS4D STATION NUMBER 390742075300102 LATITUDE 39°07'42" LONGITUDE 075

WELL DEPTH 25.0 FEET BELOW LAND SURFACE, GEOLOGIC UNIT: COLUMBIA AQU

DAY

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

MEAN

MAX

MIN

OCT

4.62

4.63

4.65

4.94

4.83

4.83

4.80

4.80

4.79

4.79

4.77

4.76

4.83

5.04

4.90

4.88

4.87

4.87

4.90

5.11

5.01

4.99

5 .00

4.99

5. 00

5.03

5.13

5.03

5.01

5.01

5.13

4.62

1995

GROUND - WATER LEVEL ELEVATIONS, IN FEET ABOVE SEA LEVEL, DAILY MEAN VALUE

1996

NOV

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

.02

.07

.06

.05

.02

.03

.08

.09

.04

.04

.10

.28

.15

.52

.42

.31

.29

.30

.33

.35

.38

.35

.37

.40

.40

.41

.42

.38

.51

.46

.25

.52

.02

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

DEC JAN FEB

.47 5.75

.44 5.81

.45 5.94

.45

.45

.47

.46

.44

.52

... ... ...

6.00

... ... ...

... ... ...

... ... ...

.48

.61

.56

.53 6.05

... ... ...

6.88

... ... ...

6.95

6.52

6.53

.78

.80

.82 --- 6.96

.83

.78 -- - 6.89

.73 6.68

.73

... ... ...

... ... ...

... ... ...

MAR

6.90

6.95

...

6.98

6.97

6.92

6.86

6.82

6.83

6.82

APR

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

.45

.61

.51

.76

.71

.63

.58

.62

.55

.55

.50

.43

.39

.38

.29

.27

.25

.16

.20

MAY

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

7

6

6

6

7

7

6

6

7

6

.10

.05

.04

.03

.36

.22

.14

.48

.62

.52

.57

.57

.45

.40

.37

.44

.39

.37

.35

.30

.15

.05

.01

.96

.94

.96

.02

.05

.98

.92

.62

.92

JUN

6

6

6

6

6

6

6

6

6

6

6

6

7

6

6

6

6

6

7

7

7

7

7

7

7

7

7

7

7

6

.89

.87

.98

.92

.91

.84

.83

.79

.76

.77

.85

.89

.36

.99

.95

.90

.89

.95

.79

.39

.31

.28

.25

.13

.09

.07

.02

.13

.79

.76

JUL

7.

7.

7.

6.

6.

6.

6.

6.

6.

6.

6.

6.

7.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

6.

7.

6.

06

04

02

93

86

86

85

87

85

81

76

80

18

88

85

86

81

80

89

79

75

73

73

71

68

69

63

62

61

62

62

81

18

61

AUG

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

.77

.64

.58

.55

.54

.52

.50

.49

.49

.48

.46

.45

.75

.74

.70

.67

.67

.66

.65

.63

.60

.59

.57

.55

.53

.49

.46

SEP

6.41

6.36

6.27

6.22

6.19

6.18

6.16

6.13

6.11

6.04

6.05

6.04

6.02

5.97

5.95

5.95

6.29

6.12

6.07

6.04

6.04

6.12

6.08

6.09

6.05

6.02

6.04

6.07

6.17

6.41

5.95
Table 2. Daily mean water-level elevations in wells DM110D and DM11 OS, piezometers GS4D and GS4S, and Pi

Base, Kent County, Delaware, October 1995 through December 1996 Continued

WELLGS4S STATION NUMBER 390742075300101 LATITUDE 39°07'42" LONGITUDE 075

WELL DEPTH 5.0 FEET BELOW LAND SURFACE, GEOLOGIC UNIT: COLUMBIA AQUI

GROUND-WATER LEVEL ELEVATIONS, IN FEET ABOVE SEA LEVEL, DAILY MEAN VALUE

1995 1996

DAY

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

MEAN

MAX

MIN

OCT

3.62

3.63

3.66

3.92

3.94

3.83

3.78

3.75

3.72

3.65

3.62

3.79

3.72

3.69

3.68

3.76

. . .

3.92

3.84

3.84

3.80

3.85

4 .09

3. 80

3.75

3.74

. . .

NOV 

3.76

3.

3.

3.

3.

3.

3.

3.

3.

3.

.

3.

4.

3.

3.

3.

3.

3.

3.

3.

3.

4.

3.

3.

3.

3.

4.

3.

-

85

82

80

74

75

89

88

75

76

90

31

98

90

89

90

95

99

90

96

02

98

96

94

84

14

95

DEC 

3.93

3.

3.

3.

3.

3.

3.

3.

4.

-

.

3.

3.

3.

4.

3.

3.

-

.

3.

4.

3.

3.

.

86

86

87

88

89

85

84

03

82

84

84

26

97

92

96

03

99

95

4

4

4

3

4

4

4

4

4

4

4

4

4

4

4

JAN

.14

.40

.04

...

.99

.01

.06

.36

.29

.18

.39

.17

.10

.28

.17

.14

. . .

4

4

4

4

4

4

4

4

4

4

4

4

4

FEE

...

.42

.34

.27

. . .

.41

.68

.33

.51

.32

.23

.21

.20

.21

.16

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

MAR 

.15

.29

.20

.16

.16

.37

.26

.29

.31

.29

.34

.29

.30

.30

.40

.29

.23

.20

.23

.23

.21

.52

.41

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

APR

.59

.52

.49

.49

.83

.59

.67

.57

.58

.53

.47

.42

.35

.35

.33

.29

.27

.26

.23

.20

.18

.15

.13

.14

.44

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

MAY 

.26

.19

.22

.20

.56

.45

.50

.29

.26

.24

.42

.31

.33

.29

.23

.33

.16

.10

.09

.06

.22

.38

.45

.27

.18

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

4

4

4

4

4

4

4

4

4

4

JUN 

.14

.13

.44

.26

.31

.14

.11

.07

.08

.15

.43

.31

.22

.18

.16

.39

.10

.46

.35

.25

.29

.29

.18

.17

.22

.24

.54

. . .

JUL 

4.34

4

4

4

4

4

4

4

4

4

4

4

5

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

5

4

.30

.30

.23

.14

.23

.25

.38

.44

.52

.50

.66

.34

.53

.56

.57

.45

.51

.63

.43

.40

.43

.48

.47

.47

.54

.45

.49

.55

.61

.56

.48

.34

.14

AUG 

4.93

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

4

.49

.41

.40

.42

.43

.43

.44

.46

.48

.51

.50

.52

.38

.40

.43

.41

.40

.40

.43

.48

.46

.46

.48

.50

.53

.53

.53

.51

.50

.93

.38

SEP 

4.47

4.49

4.41

4.41

4.42

4.45

4.39

4.37

4.33

4.32

4.55

4.44

4.39

4.28

4.27

4.31

5.00

4.36

4.25

4.22

4.20

4.39

4.26

4.34

4.26

4.25

4.26

4.32

4.53

4.22

4.37

5.00

4.20
Table 2, Daily mean water-level elevations in wells DM110D and DM11 OS, piezometers GS4D and GS4S, and Pipe Elm 

Kent County, Delaware, October 1995 through December 1996 Continued

PIPE ELM BRANCH NEAR DOVER, DELAWARE STATION NUMBER 01483625 LATITUDE 39°07'42" LONGIT

DAY

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

MEAN

MAX

MIN

OCT

. . .

3.20

3.23

3.26

4.32

3.38

3.48

3.30

3.29

3.25

3.20

3.11

3.10

3.49

3.81

3.14

3.10

3.09

3.10

3.23

4.03

3.25

3.19

3.22

3.19

3.28

3. 36

3.57

3. 14

3.11

3.13

4.32

3. 09

1995

NOV

3.15

3.26

3.24

3.19

3.11

3.15

3.34

3.27

3.12

3.16

3.32

3.89

3.18

4.77

3.21

3.17

3.17

3.21

3.33

3.36

3.24

3.34

3.40

3.34

3. 33

3. 30

3.14

3.54

3.24

4.77

3.11

GAGE HEIGHT ELEVATIONS, IN FEET ABOVE SEA LEVEL, DAILY MEAN VALUES

1996

DEC

3.23

3.15

3.17

3.20

3.22

3.22

3.18

3.18

3.41

3.19

3.16

3.15

3.14

3.15

3.14

3.43

3.19

3.22

3.15

3.34

3.28

3.23

3.12

3.12

3.13

3.12

3.11

3.11

JAN

3.20

3.75

3.60

3.16

3.18

3.11

4.07

3.38

3.26

3.25

3.27

FEB

3.22

3.21

3.24

3.47

4.41

3.55

3.46

3.36

3.31

3.33

3.46

3.44

3.71

4.02

3.48

3.74

3.44

3.34

3.33

3.33

3.34

3.31

MAR

3.31

3.51

3.35

3.30

3.30

3.66

4.39

3.42

3.37

3.39

3.43

3.45

3.54

3.48

3.52

3.52

3.94

3.90

3.62

3.47

3.41

3.40

3.42

3.41

3.41

3.77

5.13

3.60

3.48

5.13

3.30

APR

5.08

4.22

3.65

3.59

3.57

3.58

4.07

3.67

4.64

4.31

3.67

3.58

3.66

3.62

3.75

4.35

3.61

3.58

3.58

3.56

3.52

3.52

3.51

3.49

3.47

3.47

3.45

3.44

3.46

3.85

3.75

5.08

3.44

MAY

3.55

3.52

3.58

3.54

4.60

3.91

3.76

4.42

4.51

3.67

3.80

3.73

3.51

3.51

3.51

3.73

3.57

3.58

3.55

3.54

3.60

3.64

3.47

3.44

3.44

3.42

3.61

3.77

3.86

3.60

3.50

3.69

4.60

3.42

JUN

3.49

3.48

3.87

3.57

3.67

3.47

3.46

3.43

3.45

3.51

3.83

3.98

4.83

3.56

3.51

3.49

3.47

3.74

6.30

4.37

3.63

3.55

3.48

3.59

3.51

3.43

3.44

3.54

3.56

3.90

3.74

6.30

3.43

JUL

3.58

3.57

3.59

3.53

3.49

3.74

3.83

4.02

4 .12

4.17

4.24

4.38

5.00

4.02

4.13

4.08

4.01

4.12

4.19

3.98

4.02

4.09

4.12

4.13

4.16

4.20

4.13

4.22

4.26

4.29

4.19

4.05

5.00

3.49

AUG

4.60

4.03

4.01

4.04

4.12

4.15

4.17

4.23

4.27

4.32

4.37

4.32

6.59

3.97

3.87

3.82

3.80

3.80

3.82

3.88

3.93

3.98

3.96

3.98

4.01

4.03

4.06

4.08

4.03

4.04

4.06

4.14

6.59

3.80

SEP

4.06

4.09

4.02

4.04

4.04

4.06

3.99

4.01

3.96

3.96

4.16

3.99

3.92

3.84

3.85

3.92

4.56

3.80

3.74

3.74

3.73

3.91

3.77

3.88

3.77

3.82

3.81

3.88

4.00

3.68

3.93

4.56

3.68
Table 3. Measured ground- and surface-water level elevations at the natural-attenuation study area, Dover Air 

Force Base, Kent County, Delaware, July 1995 through September 1996

[ Locations of wells shown in figure 2; surface-water sites shown in figure 7; --, data not collected]

WATER-LEVEL ELEVATIONS

Well 

identification 

number

1995

T . -, December July 24 March 6

IN FEET ABOVE SEA LEVEL

April 26

1996

June 4 August 16 September 

19

GROUND-WATER LEVELS

DM101D

DM101S

DM107D

DM107S

DM108D

DM108S

DM109D

DM109S

DM110D

DM110S

DM113D

DM113S

DM116D

DM116S

DM117D

DM117S

DM118D

DM118S

DM119D

DM119S

DM206D

MW10

MW12

MW11

MW18

8.99 8.86

14.96 13.25

-

-

._

9.30 8.99

13.83 11.68

9.12 8.88

15.04 14.16

8.76 8.72

8.95 8.85

6.12

10.02

6.00

4.61

5.67

5.30

5.59

3.75

8.87 8.83

8.70 8.71

8.66 8.67

7.04

12.70

21.13

-

-

-

_

13.22

20.67

12.75

20.73

12.11

12.55

7.72

11.59

7.50

5.62

7.18

6.38

7.12

5.01

__

11.98

12.05

11.94

9.29

13.72

21.05

-

-

-

_

14.32

20.68

13.83

20.91

12.97

13.51

7.04

12.29

7.77

5.67

7.37

6.37

7.27

5.02

_

12.75

12.86

12.74

11.16

12.84

20.26

10.21

10.43

9.21

9.37

13.35

19.8

12.95

19.86

12.23

12.55

7.60

11.27

7.41

5.46

7.04

6.15

--

6.59

12.05

12.15

12.04

9.35

12.79

18.04

9.87

10.04

8.98

9.09

13.5

17.73

12.9

19.24

12.4

12.75

7.51

11.66

7.22

5.43

6.92

6.14

6.84

4.72

6.61

12.00

12.1

11.96

9.12

10.92

15.91

8.78

8.90

7.95

8.04

11.22

14.98

11.01

15.81

10.58

10.86

6.80

9.68

6.64

5.01

6.23

4.68

6.17

4.21

5.76

10.58

10.54

10.46

8.32

34
Table 3. Measured ground- and surface-water level elevations at the natural-attenuation study area, Dover Air 

Force Base, Kent County, Delaware, July 1995 through September 1996 Continued

WATER-LEVEL ELEVATIONS

Well 

identification 

number

IN FEET ABOVE SEA LEVEL

1995

July 24 December 

6

March 6 April 26

1996

June 4 August 16 September 

19

GROUND-WATER LEVELS-CONTINUED

MW19

MW20

MW21

MW22

MW23

MW36D

MW37D

MW37S

MW38D

MW38S

MW39D

MW39S

MW40D

MW40S

MW41D

MW41S

MW42P

MW43D

MW43S

MW44D

MW44S

MW61D

MW61S

MW62D

MW62S

6.07

5.84

8.58

8.61

8.82

8.35

8.42

8.06

8.52

8.52

8.53

8.55

8.79

8.61

8.8

8.78

8.54

6.05

5.88

7.07

7.14

9.04

9.02

8.94

8.94

6.53

6.34

8.63

8.65

8.76

8.43

8.50

8.14

8.56

8.60

8.55

8.55

8.74

8.58

8.74

8.75

8.66

6.55

6.44

7.44

7.51

~

8.87

8.84

8.82

8.02

7.72

11.98

12.10

12.28

11.81

11.75

11.31

12.04

12.03

11.92

11.91

12.22

12.03

12.30

12.29

12.09

7.94

7.76

9.19

9.28

22.96

12.57

12.47

12.48

8.45

8.05

12.83

12.95

13.12

12.65

12.58

12.07

12.84

12.87

13.73

12.76

13.08

12.87

13.2

13.19

12.91

8.29

8.09

9.69

9.87

-

13.49

13.43

13.43

8.02

7.71

12.11

12.22

12.35

11.93

12.28

11.38

12.12

12.15

12.01

12.06

12.33

12.13

12.38

12.4

12.18

7.94

7.75

9.21

9.40

12.67

12.59

12.57

7.91

7.59

12.06

12.05

12.28

11.82

11.73

11.25

~

--

11.83

11.99

12.33

12.04

12.31

12.36

12.08

5.82

5.67

9.08

9.09

12.57

12.56

12.48

7.21

6.94

10.22

10.48

10.62

10.24

10.28

9.75

10.41

10.39

14.34

10.36

10.65

10.69

10.50

7.17

7.03

-

_

10.89

10.80

L0.81

MW63D 9.03 12.62 13.61 12.73

35
Table 3. Measured ground- and surface-water level elevations at the natural-attenuation study area, Dover Air 

Force Base, Kent County, Delaware, July 1995 through September 1996 Continued

WATER-LEVEL ELEVATIONS IN FEET ABOVE SEA LEVEL

Well 

identification 

number

1995

July 24 December 

6

March 6 April 26

1996

June 4 August 16 September 

19

GROUND-WATER LEVELS-CONTINUED

MW63S

MW64D

MW64S

MW206D

MW206M

MW207D

MW207M

MW226D

MW226M

MW226S

MW227D

MW227M

MW227S

MWD4A

MWD4B

MWD4C

MWD4D

MWD4E

MWD4F

MWD4H

MWD4I

GS1D

GS1M

GS1S

GS2D

9.06

9.28

9.33

8.37

8.28

-

8.86

8.91

9.03

6.33

6.36

6.93

--

8.32

8.70

11.48

8.93

7.99

11.18

9.61

--

--

--

8.88

8.98

9.00

8.47

8.43

8.62

8.62

8.78

8.81

8.91

-

-

-

8.59

9.81

12.04

8.78

8.22

12.36

7.97

8.59

8.6

8.72

7.79

12.64

13.14

13.24

11.57

11.42

11.64

11.62

12.28

12.31

12.56

_

-

-

13.55

11.44

13.71

16.66

12.28

10.48

17.02

9.36

11.61

10.88

9.28

10.30

13.8

14.27

14.39

12.38

12.14

12.40

12.43

13.18

13.22

13.00

_

-

15.29

11.94

13.58

16.44

13.2

11.15

16.49

10.52

12.40

11.42

9.59

12.87

13.29

13.39

11.70

11.54

11.75

11.72

12.39

12.45

12.66

9.56

9.61

9.60

13.52

11.55

13.39

15.75

12.41

10.70

16.20

11.06

11.73

10.83

9.41

-

13.47

13.58

11.64

11.46

11.74

11.69

12.31

12.36

12.56

9.11

9.20

9.83

11.69

12.00

12.95

15.39

12.23

10.91

14.83

11.33

11.73

11.16

9.77

10.23

-

11.26

11.32

10.20

10.12

10.29

10.32

10.70

10.76

10.94

8.04

8.07

9.14

11.61

10.34

11.07

12.98

10.77

9.63

12.8

11.05

10.29

10.09

9.51

9.10

GS2M 8.16 10.26 10.36 9.33

36
Table 3. Measured ground- and surface-water level elevations at the natural-attenuation study area, Dover Air 

Force Base, Kent County, Delaware, July 1995 through September 1996 Continued

WATER-LEVEL ELEVATIONS IN FEET ABOVE SEA LEVEL

Well 

identification - 

number

1995

July 24 December March 6 April 26

1996

June 4 August 16 September 

19

GROUND-WATER LEVELS-CONTINUED

GS2S

GS3M

GS3S

GS4D

GS4M

GS4S

GSCP1

GSCP3D

GSCP3M

GSCP4M

GSCP5M

GSCP6D

GSCP8

GSCP9S

MWDD1F

GS1 staff

GS3 staff

GS4 staff

8.04 9.78

6.17 6.88 8.27

5.86 6.56 6.76

4.08 6.95 7.25

5.20 6.38 6.53

6.57 4.26 4.26

- _ _

- _ _

- _ _

-

_

 _ _

 - -

- _ _

6.20

SURFACE-WATER STAGE

 _ _

- _ _

1.98

9.73

8.11

6.51

7.00

6.21

4.26

8.90

7.70

9.10

10.90

11.40

~

-

5.44

2.10

2.04

9.90

8.07

6.75

6.73

6.23

4.4

7.47

8.48

7.90

8.75

9.35

11.40

13.98

11.90

5.08

1.88

1.69

9.08

7.30

6.33

3.56

5.68

6.22

6.74

7.13

7.13

7.54

9.22

9.69

11.51

10.44

4.89

1.95

1.88

1.60

37
Table 4. Areal electro-magnetic conductivity survey data at the natural-attenuation study area, Dover Air Force

Base, Kent County, Delaware, March 1996

[Values are millimhos per meter; , no data; locations of sites shown in figure 4]

Site

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

20-meter spacing

Horizontal 

dipole

11.0

10.0

9.6

9.9

9.4

17.0

13.0

9.0

9.0

10.0

11.5

14.0

10.5

10.0

13.5

10.0

10.5

10.0

10.0

9.0

10.0

9.2

8.0

10.0

10.5

9.8

6.6

9.6

11.0

10.5

9.0

9.5

Vertical 

diplole

17.0

16.0

11.0

14.0

12.0

15.0

19.0

11.0

11.5

12.0

12.0

5.0

13.0

13.5

17.0

11.0

10.0

11.0

12.0

9.5

11.0

13.0

14.0

12.0

12.5

12.5

13.0

12.0

14.0

17.0

16.0

12.0

10-meter spacing

Horizontal 

dipole

6.6

5.0

6.4

5.0

6.8

11.0

10.0

7.2

7.2

8.6

9.6

11.0

5.4

5.2

12.0

9.0

9.6

7.8

9.9

10.0

9.4

7.2

3.6

8.8

8.4

10.0

5.0

6.S

S.4

7.8

8.0

7.2

Vertical 

dipole

11.0

7.8

7.5

7.2

6.0

12.0

13.0

7.6

8.0

8.4

9.4

13.0

5.2

5.6

27.0

9.6

8.6

8.0

10.0

10.0

8.2

8.4

8.6

9.2

9.6

4.4

7.8

8.2

9.8

9.8

11.0

9.0

38
Table 4. Areal electro-magnetic conductivity survey data at the natural-attenuation study area, Dover Air Force

Base, Kent County, Delaware, March 1996 Continued

Site

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

20-meter spacing

Horizontal 

dipole

7.2

8.8

9.6

13.0

10.0

9.4

11.0

11.0

11.0

11.0

11.0

10.0

9.6

!0.0

13.0

13.0

12.0

15.0

10.0

11.0

9.0

9.8

9.4

9.4

9.8

9.4

9.4

9.0

9.6

9.8

9.5

9.6

8.6

Vertical 

diplole

10.0

11.5

13.0

14.0

12.0

13.5

14.0

14.0

13.0

13.0

14.5

14.0

13.0

14.0

17.0

11.0

13.0

13.0

11.0

9.6

12.0

10.0

11.0

11.0

9.6

10.5

11.0

10.5

10.C

12.0

11.0

11.0

9.6

10-meter spacing

Horizontal 

dipole

5.2

6.0

6.0

10.0

10.0

11.0

11.0

13.0

17.0

16.0

15.0

14.0

10.0

10.0

12.0

11.0

11.0

13.0

8.2

8.0

6.4

7.2

6.4

7.1

6.2

7.0

6.7

7.2

7.2

6.3

7.4

8.1

7.3

Vertical 

dipole

6.8

7.2

7.8

9.3

8.4

13.0

13.0

17.0

16.0

19.0

20.0

17.0

12.0

12.0

9.4

11.0

13.0

13.0

9.6

8.1

9.0

9.0

7.6

8.2

5.6

7.6

8.1

4.4

5.4

7.9

9.4

7.5

7.3

39
Table 4. Areal electro-magnetic conductivity survey data at the natural-attenuation study area, Dover Air Force

Base, Kent County, Delaware, March 1996 Continued

Site

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

20-meter spacing

Horizontal 

dipole

3.3

13.4

20.5

17.5

19.5

18.0

15.0

12.0

11.0

13.0

14.0

12.5

11.0

12.0

15.0

16.0

14.0

14.5

15.0

15.0

14.0

14.0

9.4

9.6

9.4

19.0

--

13.5

16.5

18.0

18.0

17.5

15.0

Vertical 

diplole

4.3

13.2

15.0

17.0

11.0

12.5

12.0

13.0

11.5

10.0

10.5

9.4

12.0

13.0

10.0

15.0

14.0

15.0

17.0

26.0

23.0

18.0

16.0

13.0

14.0

13.0

--

17.0

17.0

18.5

17.0

16.0

19.0

10-meter spacing

Horizontal 

dipole

8.3

11.8

20.5

18.0

19.0

19.5

14.0

9.8

10.0

11.0

15.0

11.0

11.0

11.0

17.0

13.0

14.0

12.0

12.0

10.0

11.0

7.8

6.6

7.4

6.2

17.0

..

11.0

16.0

16.0

17.0

13.0

10.0

Vertical 

dipole

8.2

13.8

20.0

18.0

15.0

13.0

13.0

12.0

10.0

14.0

8.6

11.5

12.0

10.0

14.5

16.0

15.0

16.0

13.0

17.0

14.0

9.4

8.8

9.2

8.8

16.0

..

16.3

15.0

18.0

18.0

17.0

14.0

40
Table 4. Areal electro-magnetic conductivity survey data at the natural-attenuation study area, Dover Air Force

Base, Kent County, Delaware, March 1996 Continued

Site

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

20-meter spacing

Horizontal 

dipole

15.0

14.0

14.0

14.0

12.0

14.0

14.0

12.0

--

--

..

--

-

-

--

--

--

12.0

11.0

11.0

10.0

11.0

12.0

15.0

13.0

13.0

Vertical 

diplole

18.0

14.0

15.0

13.0

16.0

16.0

15.0

15.0

18.0

20.0

20.0

17.0

16.0

13.0

18.0

13.0

8.6

15.0

13.0

19.0

6.0

23.0

19.0

17.0

18.0

20.0

19.0

19.0

10-meter spacing

Horizontal 

dipole

12.0

12.0

11.0

11.0

9.6

12.0

10.0

9.6

--

-

..

-

--

--

..

-

--

--

6.2

8.6

6.2

8.4

6.2

7.2

9.2

8.0

8.4

Vertical 

dipole

13.0

12.0

13.0

9.8

13.0

12.0

12.5

12.0

22.0

19.5

18.0

17.0

21.0

17.0

20.0

10.0

13.0

16.0

16.0

9.5

10.0

11.0

5.6

8.8

9.8

11.0

13.0

10.5

41
Table 5. Ground- and surface-water quality data at tlie natural-attenuation study area, Dover Air force nase, 

Kent County, Delaware, July - August 1995, May - July 1996, and August 1996, for inorganic

constituents

[Locations of sample sites shown on figures Sand 6; nS/cm, microsiemens per centimeter; °C, degrees Celsius; mg/L, milligrams per liter; --, no 

data; nmol/L, nanomoles per liter; |Jg/L, micrograms per liter, quality assurance samples are at end of table; (d), quality control duplicate samples; 

Eq. Blank, equipment blank; August, 1996 samples and all field parameters were analyzed by USGS personnel; all others were analyzed by a 

contract laboratory]

FIELD PARAMETERS

Sample 

identification 

number

Sample 

date Time

Specific 

conductance

(MS/

cm)

PH, 

(standard 

units)

Temperature 

(°C)

Oxygen, 

dissolved 

(mg/L)

MAJOR IONS

Hydro- cd

gen, cium 

mean 

, (mg/L value,

(nmol/L 

asH2 ) Ca)

Magnesium 

(mg/L 

as 

Mg)

Sodium,

(mg/L) 

asNa)

GROUND- WATER SAMPLES

DM101D

DM102D

DM102D

DM107D

DM107D

DMI07S

DM108D

DM108D

DM10SS

DM109D

DMIIOD

DM110D

DM1 10S

DM110S

DM110S

DM113D

DM113D

DM113S

DM117D

GS1D

GS1D

GS1M

GS1M

GS1S

GS1S

GS2D

GS2D

GS2M

GS2M

GS2S

GS2S

GS3M

08-03-96

06-06-96

08-02-96

05-02-96

08-02-96

05-01-96

05-13-96

08-02-96

05-10-96

08-03-96

06-13-96

08-03-96

08-21-95

06-13-96

08-03-96

06-04-96

08-02-96

08-08-95

05-21-96

08-11-95

05-23-96

08-10-95

05-23-96

08-10-95

05-23-96

08-09-95

06-05-96

08-09-95

06-05-96

08-09-95

06-05-96

08-28-95

-

01:OOPM

--

10:00 AM

--

03:3 0PM

-

-

12:OOPM

--

10:00 AM

-

12:15 PM

12:OOPM

--

03:OOPM

-

02:30 PM

03:OOPM

10:00 AM

OhOOPM

01:OOPM

11:00 AM

11:00 AM

08:00 AM

11:30 AM

08:00 AM

10:00 AM

11:00 AM

08:30 AM

04:00 PM

09:30 AM

-

153

-

86

--

69

80

-

94

--

185

-

1751

1467

--

101

-

87

96

107

124

226

74

146

80

97

68

98

75

97

89

93

8.80

5.54

5.05

3.56

5.08

5.27

5.42

5.43

4.58

8.29

4.58

4.94

5.94

5.73

5.84

5.42

6.06

5.00

5.61

5.83

6.00

5.51

5.21

5.31

5.54

5.85

5.64

5.49

5.77

5.43

5.68

5.58

18.9

18.5

19.4

15.0

16.2

10.9

12.6

15.4

11.5

18.1

15.8

16.9

20.5

13.3

19.6

16.9

19.0

17.00

16.1

17.6

15.6

20.1

15.0

26.2

15.1

19.5

13.8

22.6

13.0

20.6

14.5

17.3

0.42

3.32

2.22

1.34

0.11

7.0

0.47

0.18

1.15

0.00

5.69

2.30

0.00

0.00

0.00

5.00

3.73

3.35

0.00

0.58

0.00

0.5

0.10

1.30

0.00

0.75

0.00

0.50

0.00

0.00

0.00

6.15

8.5 26.02

10.2

0.95 13.76

<5.0

1.5 6.28

<5.0

<5.0

1.35 3.99

<5.0

21.2 8.05

12.3

4.1 23.65

51.1

42.9

0.7 46.21

<5.0

7.8 10.87

<5.0

<5.0

<5.0

<5.0

8.1

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

3.76

<5.0

5.31

<5.0

2.52

<5.0

<5.0

2.13

<5.0

2.73

5.9

11.45

91.2

74.5

69.17

<5.0

3.28

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

10.89

10.1

9.60

11.7

10.61

6.90

10.50

10.86

8.60

10.94

14.4

15.06

118.0

83.0

56.27

11.0

12.2

6.80

8.20

9.90

10.4

12.9

11.3

14.0

10.40

10.0

9.50

10.40

9.50

9.90

9.70

10.5

42
MAJOR IONS

Potassium 

(mg/ 

Las 

K)

Alkalinity, 

field 

(mg/ 

L as 

Ca 

C03 )

Hydrogen 

sulfide, 

field 

(mg/L 

as 

H2S)

Suffate 

(mg/L 

as 

S04 )

Chloride 

(mg/L 

asCI)

NitroBro- gen, 

Fluo- mide, amride (mg/ monia 

(mg/L L as (mg/L 

as F) Br) as

Nitrogen, 

kjeldahl 

(mg/L 

asN)

Nitrate 

(mg/ 

L as

N)

NU Phostrate, , 

, phate,

P1US ortho SamP'e 

m (meJ identification

uite' i _ c number 

. L as (Tmg/ PQ4 )

Las

N)

GROUND- WATER SAMPLES-CONTINUED

2.87

<5.0

1.86

<5.0

1.54

<5.0

<5.0

1.53

<5.0

1.03

<5.0

1.63

<5.0

<5.0

0.37

<5.0

4.2

5.4

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

-

7.50

-

-

--

7.50

--

--

--

--

-

390.0

268.0

--

14.5

-

7.5

17.0

42.5

45.0

8.05

4.50

4.85

13.0

20.5

17.3

20.5

21.5

23.0

18.5

10.0

0.000

0.008

0.000

0.003

0.000

0.050

0.000

0.000

0.004

0.000

0.014

0.000

0.021

0.022

0.002

0.002

0.008

0.000

0.042

0.011

0.007

0.006

0.010

0.000

0.000

0.025

0.008

0.025

0.014

0.006

0.002

0.025

6.68

25.3

21.33

4.4

3.70

11.8

5.1

4.00

15.4

11.04

74.2

81.43

37.3

69.2

45.38

0.76

0.52

17.9

16.2

1.5

<0.50

3.3

4.3

3.7

5.8

4.0

3.8

4.9

4.4

4.9

5.9

18.9

10.00

11.80

9.57

10.80

9.95

5.10

12.00

10.10

9.60

7.65

6.10

4.11

304.00

250.00

372.71

13.40

11.39

3.30

4.70

11.30

11.00

15.40

0.50

12.90

10.20

9.90

10.60

10.30

10.80

9.20

9.50

4.70

0.35

O.10 - <0.10

<0.02

<.10 - <10

0.07 <.02

<.10 - <.10

<.io - <.io

0.16 <.02

<.10 - <.10

0.69

<.10 - <.10

<.02

<.10 - <.10

<.10 - 0.15

4.54 <02

<.10 - <.10

<.02

<.10 - <10

<10 - <.10

<10 - <.10

<.10 - <.1Q

<.10 - 3.3

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.io - <.io

<.10 - <10

<.10 - <.10

<.10 - 0.21

<.10 - 0.1

<.10 - <.10

-

<0.50

-

<.50

--

<.50

<.50

-

<50

-

<.50

-

1.8

1.2

--

<.50

-

<.50

<.50

<.50

<.50

3.8

<.50

<.50

<50

<.50

<.50

<.50

<50

<.50

<.50

<.50

2.13

3.4

19.48

0.57

2.59

<0.5

<.5

1.13

0.56

0.18

0.69

1.77

1.2

1.2

O.02

2.2

11.81

0.66

<5

<5

<.5

<.5

<5

<.5

<- 5

<5

<.5

<.5

<.5

<- 5

<.5

<.5

<0.02 DM101D

O.5 O.5 DMI02D

<02 DM102D

0.57 <.5 DM107D

<.02 DM107D

0.36 <.5 DM107S

0.48 <5 DM108D

<.02 DM108D

0.57 <.5 DM108S

<.02 DM109D

0.79 <.5 DM110D

<.02 DM110D

<.5 <.5 DM110S

<-5 <.5 DM110S

<.02 DM110S

2.5 <.5 DM113D

<.02 DM113D

0.7 <.5 DM113S

<-5 <.5 DM117D

<-5 <.5 GS1D

<.5 <.5 GS1D

<.5 <.5 GS1M

0.18 <.5 GSIM

<.5 <.5 GS1S

<.5 <.5 GS1S

<.5 <5 GS2D

<.5 <.5 GS2D

<.5 <.5 GS2M

<-5 <.5 GS2M

<.5 <.5 GS2S

<-5 <.5 GS2S

0.24 <.5 GS3M

43
Table 5. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May- July 1996, and August 1996, for inorganic

constituents Continued

FIELD PARAMETERS

Sample 

identification 

number

Sample 

date Time

Specific 

conductance 

(V&l 

cm)

pH, 

(standard 

units)

Temperature 

(°C)

Hydro- Oxygen, 

gen, mean dis- 

. . value, solved (nmol/L

(mg/L) «H2 )

MAJOR IONS

Calcium 

(mg/L 

as 

Ca)

Magnesium 

(mg/L 

as 

Mg)

Sodium, 

(mg/L)

asNa)

GROUND- WATER SAMPLES-CONTINUED

GS3M(d)

GS3M

GS3S

GS3S

GS4D

GS4D

GS4M

GS4M

GS4S

GS4S

GSCP3D

GSCP3D

GSCP3M

GSCP3M

GSCP4M

GSCP4M

GSCP5M

GSCP5M(d)

GSCP5M

GSCP6D

GSCP6D

GSCP8

GSCP9S

GSCP9S

MW11

MW18

MW19

MW19

MW19

MW20

MW21

MW37D

05-22-96

05-22-96

08-17-95

05-22-96

08-17-95

05-20-96

08-16-95

05-20-96

08-16-95

05-20-96

06-11-96

08-02-96

06-11-96

08-02-96

06-11-96

08-02-96

06-07-96

06-07-96

08-02-96

06-10-96

08-02-96

07-11-96

06-12-96

08-03-96

08-22-95

08-03-95

08-08-95

05-17-96

08-03-96

07-28-95

07-27-95

07-27-95

-

02:00 PM

02:00 PM

08:00 AM

10:00 AM

09:00 AM

12:30 PM

12:OOPM

09:30 AM

01:OOPM

09:30 AM

-

11:00 AM

-

01:30PM

-.

09:30 AM

-

-

01:30PM

10:00 AM

04:00 PM

-

01:OOPM

02:30 PM

08:30 AM

12:OOPM

-

09:00 AM

01:00 PM

09:30 AM

-

87

338

278

110

108

90

91

92

108

82

-

130

-

120

..

122

-

-

135

..

121

98

-

103

86

106

125

-

74

87

103

-

5.66

6.12

6.26

5.94

5.99

5.45

5.56

5.62

5.58

5.2

5.38

5.67

5.32

5.53

5.81

5.69

-

5.33

5.38

5.82

4.94

5.4

5.08

5.2

5.06

5.13

5.55

5.25

4.96

5.23

4.78

-

14.2

18.9

13.3

17.3

13.5

18.4

16.2

19.5

13.5

16.6

17.9

15.8

17.4

14.9

15.7

15.9

-

17.5

17.6

17.0

15.8

27

16.1

16.4

19.4

16.6

14.8

17.5

18.8

19.8

17.6

..

7.1

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

2.21

0.00 1.95

0.00

2.10 1.75

0.00

0.00 0.79

0.00

-

0.00 1.01

0.00

0.00 5.5

0.82

0.00

0.00 2.8

0.70

6.6

3.1

3.7

4.48 3.4

3.85

0.15

0.20

<5.0

<5.0

15.3

16.1

5.8

6.1

<5.0

<5.0

<5.0

<5.0

<5.0

6.73

<5.0

4.73

<5.0

6.85

<5.0

<5.0

4.57

<5.0

4.75

10.2

<5.0

8.78

<5.0

<5.0

<5.0

5.7

11.00

<5.0

<5.0

<5.0

<5.0

<5.0

12.1

11.5

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

3.49

<5.0

2.21

<5.0

3.64

<5.0

<5.0

2.23

<5.0

1.94

<5.0

<5.0

4.23

<5.0

<5.0

<5.0

<5.0

4.60

<5.0

<5.0

<5.0

9.6

9.4

13.1

10.0

9.0

7.1

6.6

6.9

6.3

7.3

10.7

12.47

12.0

10.21

12

11.73

12.7

13.1

12.65

<5.0

8.35

14.8

10.4

9.63

11

8

10.4

10.8

10.55

6.7

10.2

12.3

44
MAJOR IONS

Potassium 

(mg/ 

Las

Alkalinity, 

field 

(mg/ 

L as 

Ca 

C03 )

Hydrogen 

sulfide. 

field 

(mg/L 

as 

H2S)

Sulfate 

(mg/L 

as 

S04 )

Chloride 

(mg/L 

asCl)

NitroBro- gen, 

Fluo- mide, amride (mg/ monia 

(mg/L L as (mg/L 

as F) Br) as 

NH4 )

NiNitro- N. t trate,

ff> rate P1US kjel- mdahl W trite,

\-t US (mg/L (mg/ 

as N) ' L as 

N)

Phosphate, 

ortho SamPIe 

(n\£/ identification

Las number 

P04 )

GROUND- WATER SAMPLES-CONTINUED

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

0.84

<5.0

1.03

<5.0

0.81

<S.Q

<5.0

1.10

0.0

G.S!

<3.C

<5.Q

1.13

<5.0

<5.0

11

<5.0

1.03

<5.Q

<5.0

<5.0

-

9.50

120.0

65.0

-

22.5

8.0

10.5

18.5

10.0

7.5

-

35.50

-

18.50

..

22.00

-

-

13.00

..

12.50

19.00

-

22.00

8.00

17.50

22.00

-

4.50

4.00

8.50

-

0.003

0.016

0.007

 0.058

0.000

0.680

0.030

0.171

0.000

0.009

0.000

0.035

0.000

0.033

0.034

0.000

--

0.000

0.000

0.000

0.000

0.026

0.000

0.004

0.001

0.003

0.003

0.000

0.000

0.000

0.000

17.1

17.2

11.6

15.6

12.8

15.8

21.3

23.3

21.1

23.8

9.4

1.03

1.4

6.358

12.3

7.73

6.2

6.2

4.71

<.50

6.426

22.6

15.4

10.89

10.6

20.4

6.4

10.7

9.74

15.6

12.1

14.0

4.40

4.50

32.40

21.50

6.60

5.10

3.80

3.80

3.80

5.40

8.60

12.62

13.60

6.39

12.30

12.04

16.0

15.90

10.17

<.50

6.65

8.60

4.40

3.36

7.60

3.0

<.50

7.40

6.33

3.40

10.10

11.60

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.10 - 0.17

<.10 - 0.13

<.10 - <.10

<.10 - <.10

<.10 - 0.1

<.10 - 0.13

<.10 - <-10

0.04 1.34

<.10 - 0.16

<.02

<.10 -- 0.13

0.04 0.89

<.10 - <.10

<.10 - <.10

0.06 0.94

<.10 - <.10

0.56

<.10 - 0.11

<.10 - <.10

<.02

<.10 - <.10

<.10 - <.10

0.13 - <.10

<.10 - 0.48

0.21 3.26

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.50 <.5 0.29

<.50 <.5 0.29

<.50 <.5 84.1

<.50 <.5 <.5

<.50 <.5 <.5

<.50 <.5 <.5

<.50 0.52 <.5

<.50 <.5 <.5

<.50 <.5 <.5

<.50 <.5 <.5

<.50 <.5 0.42

<.02

<.50 <.5 <.5

1.07

<.50 <.5 <.5

<.02

<.50 <.5 <.5

<.50 <.5 <.5

0.123

-

0.213

<.50 <.5 <.5

<.50 <.5 <.5

0.041

<.50 <.5 <.5

<.50 <.5 0.27

<.50 0.72 0.62

0.51 0.6 1.1

2.55

<.50 <.5 0.44

<.50 <.5 <.5

<.50 0.51 0.4

<.5 GS3M(d)

<.5 GS3M

<.5 GS3S

<.5 GS3S

<.5 GS4D

<.5 GS4D

<.5 GS4M

<.5 GS4M

<.5 GS4S

<.5 GS4S

<5 GSCP3D

<.02 GSCP3D

<.5 GSCP3M

<.02 GSCP3M

<.5 GSCP4M

<.02 GSCP4M

<.5 GSCP5M

<.5 GSCP5M(d)

<.02 GSCP5M

GSCP6D

<.02 GSCP6D

<.5 GSCP8

<.5 GSCP9S

<.02 GSCP9S

<.5 MW11

<.5 MW18

<.5 MW19

<.5 MW19

<.02 MW19

<.5 MW20

<.5 MW21

<.5 MW37D

45
Table 5. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May - July 1996, and August 1996, for inorganic

constituen ts Con tin ued

FIELD PARAMETERS

Sample 

identification 

number

Sample 

date Time

Specific 

conductance 

(MS/ 

cm)

PH,

(standard 

units)

Temperature 

(°C)

_ Hydro- Oxy- J 

gen, 

gen, 

mean dis- , 

. , value, solved 

, ,. . (nmol/L

(mg/L) asH2 )

MAJOR IONS

Calcium 

(mg/L 

as 

Ca)

Magnesium 

(mg/L 

as 

Mg)

Sodium, 

(mg/L) 

as Na)

GROUND- WATER SAMPLES-CONTINUED

MW37S

MW37S(d)

MW37S

MW37S

MW39D

MW39D(d)

MW39S

MW39S

MW39S

MW40D

MV/40S

MAV41D

MW41S

MW43S

MW43S(d)

MW61S

MW61S

MW61S

MW61S

MW62D

MW62S

MW62S

MW64S

MW64S(d)

MW206D

MW206D

MW206D(d)

MW206M

MW206M

MW206M

MW226D

MW226M

08-07-95

08-07-95

05-28-96

08-02-96

08-01-95

08-01-95

07-26-95

06-12-96

08-03-95

08-03-95

08-03-95

07-31-95

08-01-95

07-26-95

07-26-95

08-04-95

08-15-95

06-21-96

08-03-96

06-19-96

06-18-96

08-03-96

06-14-96

06-14-96

08-01-95

05-31-96

05-31-96

08-07-95

05-30-96

08-03-96

08-02-95

08-02-95

11:30 AM

-

02:00 PM

-

11:00 AM

..

03:OOPM

01:OOPM

-

11:25 AM

10:00 AM

01:OOPM

08:00 AM

10:00 AM

--

09:00 AM

09:00 AM

12:OOPM

11:30 AM

OhOOPM

-

10:00 AM

-

08:00 AM

09:30 AM

-

03:OOPM

09:00 AM

08:30 AM

09:00 AM

103

-

118

-

98

..

171

171

-

71

93

72

180

72

--

1547

-

1612

--

59

117

--

557

81

85

-

85

90

75

86

5.12

-

5.16

5.31

5.09

..

4.89

5.18

5.04

5.28

4.91

5.21

5.36

5.14

-

5.85

-

5.89

5.70

5.25

5.36

5.42

5.08

-

5.07

5.03

-

5.14

5.28

5.05

5

5.21

16.1

-

12.6

17.6

17.7

_

17.7

14.5

18.1

17.9

19.1

16.7

13.7

17.0

--

15.9

-

22.0

18.0

14.7

16.4

16.8

18.5

-

16.8

15.6

-

17.6

13.8

17.9

16.5

19

1.59

1.83

0.85 1.35

1.5

.-

0.20

0.00

2.72 2.40

4.05

3.6

4.8

0.2

1.5

-

0.66

0.00

0.00 2.75

7.6

0.00

0.00 9.80

0.00

-

1.8

1.51

..

1.82

1.22

0.78 3.80

5.0

1.67

<5.0

<5.0

<5.0

6.26

<5.0

<5.0

<5.0

5.1

8.61

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

55.9

60.1

65.97

<5.0

<5.0

7.32

33.7

33.8

<5.0

<5.0

<5.0

<S.O

<5.0

8.01

<5.0

<5.0

<5.0

<5.0

<5.0

3.43

<5.0

<5.0

<5.0

<5.0

5.56

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

43.1

45.6

48.56

<5.0

<5.0

3.84

23.9

24.2

<5.0

<5.0

<5.0

<5.0

<5.0

4.06

<5.0

<5.0

17.3

17.6

15.7

15.88

11.1

10.7

22.2

20.8

21.65

8.1

13

8.2

24.7

7.3

7.8

155

185

138.22

8.8

18.1

15.39

40.1

41.4

10.2

10.8

10.5

9.7

9.2

10.74

8.4

10.8

46
Potassium 

(mg/ 

Las 

K)

Alkalinity, 

field 

(mg/ 

L as 

Ca 

C03 )

Hydrogen 

sulfide, 

field 

(mg/L 

as 

H2S)

Sulfate 

(mg/L 

as 

S04 )

Chloride

(mg/L 

asCl)

MAJOR IONS

NitroBro- gen, 

Fluo- mide, amride (mg/ monia 

(mg/L L as (mg/L 

as F) Br) as 

NH4 )

Nitrogen, 

kjeldahl 

(mg/L 

asN)

Nitrate 

(mg/ 

L as

N)

Nitrate, 

plus 

nitrite, 

(mg/ 

L as 

N)

Phosphate, 

ortho 

(mg/ 

L as 

P04 )

Sample 

identification 

number

GROUND- WATER SAMPLES-CONTINUED

<5.0

<5.0

<5.0

0.77

<5.0

<5.0

<5.0

<5.0

0.47

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

2.24

<5.0

<5.0

1.17

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

0.87

<5.0

<5.0

12.60

-

14.50

-

14.00

--

19.50

8.00

-

9.50

11.5

11.0

23.5

10.00

--

462

--

440

8.00

31.50

11.80

S.OO

10.60

13.0

14.50

6.60

8.60

0.004

-

0.009

0.000

0.000

-

0.004

0.000

0.000

0.000

0.002

0.000

0.057

0.007

-

0.082

0.000

0.000

0.002

0.000

0.000

0.000

-

0.004

0.000

0.005

0.006

0.000

0.000

0.023

23.3

23.6

23.4

18.81

9

9.1

23.4

44.8

34.65

3.9

8.5

2.2

24.90

12.20

12.40

10.20

-

12.10

8.56

0.53

4.50

-

234.0

231.0

2.50

1.60

1.60

9.70

9.20

7.75

1.20

5.10

6.50

6.50

6.40

5.11

10.30

10.50

17.80

9.40

9.04

7.50

7.40

7.60

16.20

3.30

3.30

202.00

-

208.00

150.63

7.80

15.90

11.84

39.70

38.80

11.90

13.60

13.60

6.90

9.00

8.61

8.70

11.30

<.10 - <.10

<.10 - <.10

<.10 - <.10

0.04 <.02

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.10 - <.10

0.04 <.02

<.10 - <.10

<.10 - <.10

<.10 -- <.10

<.10 - <.10

<.10 - 0.1

<.10 - <-10

<.10 - <.10

-

<.10 - 0.11

2.80 <.02

<.10 - <10

<.10 - <.10

0.15 1.67

<.10 - 0.26

<.10 - 0.26

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.10 - <.10

<.10 - <.10

0.15 <.02

<.10 - <.10

<.10 - <.10

<.50

<.50

0.81

-

<.50

<.50

<.50

<.50

-

<.50

<.50

<.50

<.50

<.50

<.50

1.4

-

1.5

<.50

<.50

-

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

0.6

0.61

<.5

1.94

0.8

0.79

<.5

<.5

2.149

1.1

1.4

1.7

<.5

<.5

<5

0.82

-

0.75

<.02

2.4

<. 5

0.04

<.5

<5

0.87

0.69

0.69

<.5

<.5

0.87

2.4

0.84

0.52

0.54

1.2

-

0.82

0.88

<.5

0.48

-

1.2

1.6

2

<.5

0.18

0.18

< 5

-

<.5

2.6

<. 5

-

<.5

<5

0.97

0.76

0.77

0.14

0.1

-

2.7

0.91

<.5

<.5

<.5

<.02

<5

<5

<.5

<.5

<.02

<5

<5

<.5

<.5

<.5

<S

<. 5

-

<.5

<.02

<5

<. 5

<.02

<.5

<5

<.5

<. 5

<.5

<.5

<.5

<.02

<5

<5

MW37S

MW37S(d)

MW37S

MW37S

MW39D

MW39D(d)

MW39S

MW39S

MW39S

MW40D

MW40S

MW41D

MW41S

MW43S

MW43S(d)

MW61S

MW61S

MW61S

MW61S

MW62D

MW62S

MW62S

MW64S

MW64S(d)

MW206D

MW206D

MW206D(d)

MW206M

MW206M

MW206M

MW226D

MW226M

47
Table 5. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May - July 1996, and August 1996, for inorganic

constituents Continued

FIELD PARAMETERS

Sample 

identification 

number

MW226M

MW226M

MW227D

MW227D

MW227D

MW227S

MWD4B

Sample 

date

06-06-96

08-03-96

08-22-95

05-02-96

08-03-96

05-06-96

05-31-96

SpepH, TemTbne due" (sta"' P6 " 

dard ture 

tance . . , _v units) (°C) (us/

cm)

Oxygen, 

gen, 

mean dis- , 

. . value, solved (nmol/L

(mg/L) asH2 )

GROUND- WATER SAMPLES-CONTINUED 

09:00 AM 88 5.01 15.8 1.46

5.39 15.9

09:30 AM 86 5.03 15.7

01:30 PM 81 4.54 15.2

5.08 16.5

12:30 PM 199 5.00 11.3

03:00 PM 148 5.75 15.1

0.32 0.35

1.35

2.21

3.03 0.90

3.9

5.1

MAJOR IONS

Calcium 

(mg/L 

as 

Ca)

<5.0

5.70

<5.0

<5.0

4.91

12.5

11.8

Magnesium 

(mg/L 

as 

Mg)

<5.0

2.54

<5.0

<5.0

2.14

11.2

7.1

Sodium, 

(mg/L) 

asNa)

11.3

11.34

10.9

11.3

9.68

20.9

6.2

SURFACE-WATER SAMPLES

GS1SW

GS1SW

GS2SW

GS2SW

GS2SW(d;

GS3SW

GS3SW

GS4SW

GS4SW(d)

GS4SW

08-10-95

05-23-96

08-10-95

06-05-95

06-05-95

08-17-95

05-22-96

08-16-95

08-16-95

05-20-96

10:15 AM 72 5.56 25.9

02:00 PM 136 5.82 16.3

10:45 AM 241 4.22 26.3

03:30 PM 127 6.16 19.5

-

I- 00PM 157 6.56 27.9

 I::*-., ;M 127 6.28 20.9

01:00 I'M S?S 6.56 27.6

-.

02:00 PM 145 6.56 '.:- . t

3.2

6.5

1.65

7.0

-

5.5

5.9

5.0

..

-

6.4

10.2

19.9

11.2

11.2

11.5

11

15.9

16.0

5.7

<5.0

<5.0

5.4

<5.0

<5.0

5.3

<5.0

20

20.3

<5.0

<5.0

10.7

5.2

8.2

8.5

12

5.5

145

144

9

QUALITY- ASSURANCE SAMPLES,

Eq. Blank (1)

Eq. Blank (2)

Eq. Blank (3)

Eq. Blank (4)

Eq. Blank (5)

Eq. Blank (6)

Eq. Blank (7)

Eq. Blank (8)

~q. Blank (9)

Cq. Blank (1C)

Eq. Blank (11)

Eq. Blank (12)

Eq. Blank (13)

Eq. Blank (14)

Eq. Blank (15)

07-27-95

08-02-95

08-03-95

08-09-95

08-11-95

08-16-95

08-16-95

08-18-95

08-22-95

05-01-96

05-21-96

05-22-96

05-30-96

06-05-96

06-12-96

-

-

-

-

-

-

-

-

-

--

-

-

-

-

-

..

..

-

..

-.

-

-

..

-

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

48
MAJOR IONS

AlkaPotas- Unity, 

slum field 

(mg/ (mg/ 

L as L as 

K) Ca 

C03 )

Hydro-

" gen 

sulfide, 

field 

(mg/L 

as 

H2 S)

Sulfate 

(mg/L 

as 

S04 )

Chloride

(mg/L 

asCl)

NitroBro- gen, Nitro- .

Fluo- mide. am- gen, 

rate ride (mg/ monia kjel- .

(mg/L Las (mg/L dahl (mg^ 

asF) Br) as (mg/L ** 

NH4) as N) '

Nitrate, 

plus 

nitrite,

(mg/ 

Las

N)

Phosphate, 

ortho SamP'e 

(msJ identification 

L as number 

P04 )

GROUND- WATER SAMPLES-CONTINUED

<5.0 9.00

1.28

<5.0 19.40

<5.0 4.00

0.81

<5.0 14.00

<5.0 32.00

<5.0 19.00

<5.0 26.50

<5.0

<5.0 28.50

<5.0

<5.0 31.50

<5.0 26.00

6.9 36.00

6.9

<5.0 29.50

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

0.015

0.000

0.0 11

0.002

0.004

0.028

0.000

0.0076

0.003

0.007

0.003

--

0.002

0.004

0.000

0.007

--

--

--

--

--

--

--

--

--

--

-

-

--

5.70

6.43

8.00

9.30

6.39

56.60

17.70

6.10

16.10

115.0

12.60

12.60

23.10

12.70

44.3

43.9

19.8

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

0.82

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

12.00

10.20

10.70

8.70

4.97

34.80

6.20

2.00

8.30

4.00

6.3

6.0

6

2.9

238

236

6.6

<.50

<.50

<.50

<.50

0.62

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.10 -- <.10 <.50 <.5

<.02 - 1.82

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.02 - 1.42

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 1.2

SURFACE-WATER SAMPLES

<.10 - <.10 0.81 <.5

<.10 - 1.1 <.50

<-10 - 0.32 0.96 <.5

<.10 - <.10 <.50 0.85

<.10 - <.10 <.50 0.86

<.10 - <.10 <.50 <.5

<.10 - 0.18 <.50 2.4

<.10 - 0.12 <.50 <.5

<.10 - 0.11 <.50 <.5

<.10 - <.10 0.51 0.98

QUALITY-ASSURANCE SAMPLES

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<-10 - <.10 <.50 <.5

<.10 <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

<-10 - <.10 <.50 <.5

<.10 - <.10 <.50 <.5

0.44

-

0.46

0.4

-

<5

1.4

<.5

-

<.5

0.95

0.95

0.37

2.8

0.29

0.26

1.1

<.5

<.5

<.5

<.5

<5

<. 5

<.5

<.5

0.50

<5

< 5

<.5

<5

<5

<5

<.5 MW226M

<.02 MW226M

<.5 MW227D

<.5 MW227D

<02 MW227D

<.5 MW227S

<.5 MWD4B

<.5 GS1SW

GSISW

<.5 GS2SW

<.5 GS2SW

<.5 GS2SW(d)

<.5 GS3SW

<.5 GS3SW

<.5 GS4SW

<.5 GS4SW(d)

<.5 GS4SW

<.5 Eq. Blank (1)

<.5 Eq. Blank (2)

<.5 Eq. Blank (3)

<.5 Eq. Blank (4)

<.5 Eq. Blank (5)

<.5 Eq. Blank (6)

<-5 Eq. Blank (7)

<.5 Eq. Blank (8)

<.5 Eq. Blank (9)

<.5 Eq. Blank (10)

<.5 Eq. Blank (11)

<.5 Eq. Blank (12)

<5 Eq. Blank (13)

<5 Eq. Blank (14)

<.5 Eq. Blank (15)

49
Table 5. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May - July 1996, and August 1996, for inorganic

constituents Continued

FIELD PARAMETERS MAJOR IONS

Sample 

identification 

number

Eq. Blank (16) 

Eq. Blank (1 7)

Sample 

date

06-13-96 

06-14-96

Specific 

Time conductance 

(US/ 

cm)

pH, Tem- 

(stan- peradard ture 

units) (° C)

Oxygen, 

dissolved 

(mg/L)

Hydrogen, 

mean 

value, 

(nmol/L 

asH2 )

QUALITY-ASSURANCE SAMPLES -CONTINUED

Calcium

(mg/L 

as 

Ca)

<5.0 

<5.0

Magnesium 

(mg/L 

as 

Mg)

<5.0 

<5.0

Sodium, 

(mg/L) 

as Na)

<5.0 

<5.0

50
MAJOR IONS

Potassium 

(mg/ 

Las 

K)

Alkalinity, 

field 

(mg/ 

Las 

Ca 

C03 )

Hydrogen 

sulfide, 

field 

(mg/L 

as

H2S)

Sulfate 

(mg/L 

as 

S04)

Chloride 

(mg/L 

asCl)

Fluoride 

(mg/L 

asF)

Bromide, 

(mg/ 

Las 

Br)

Nitrogen, 

ammonia 

(mg/L 

as 

NH4)

Nitrogen, 

kjeldahl 

(mg/L 

asN)

Nitrate 

(mg/ 

Las

N)

Nitrate, 

plus 

nitrite, 

(mg/ 

Las

N)

Phosphate, 

ortho SamPIe 

(mW identification

Las number 

P04)

QUALITY-ASSURANCE SAMPLES -CONTINUED

<5.0

<5.0

-

-

--

-

<5.0

<5.0

0.53

<50

<.10

<10

~

~

<.10

<10

<.50

<.50

<.5

<5

<.5

<.5

<5 Eq. Blank (16)

<.5 Eq. Blank (17)

51
Table 5. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May-July 1996, and August 1996, for inorganic

constituents

[Locations of sample sites shown on figures 5 and 6; mg/L, milligrams per liter; jag/L, micrograms per liter; , no data; quality-assurance samples 

are at end of table; (d), quality control duplicate samples; Eq. Blank, equipment blank; constituents analyzed in field (Fe^+Fe"1"3 and Fe+2 ) were 

analyzed by USGS personnel; all others were analyzed by a contract laboratory]

Sample 

identification 

number

Sample 

date

Aluminum, 

(Hg/Las 

Al)

Antimony, 

(Hg/Las 

Sb)

METALS

Arsenic, Barium, 

(Hg/Las (ng/Las 

As) Ba)

Cadmium, 

(Hg/Las 

Cd)

Chromium, 

(Hg/Las 

Cr)

Cobalt, 

Co)

Copper, 

(jig/Las 

Cu)

Iron, 

field, 

(mg/L as

pX

GROUND-WATER SAMPLES

DM102D

DM107D

DM107S

DM108D

DM108S

DM110D

DM110S

DM110S

DM113D

DM113S

DM117D

GS1D

GS1D

GS1M

GS1M

GS1S

GS1S

GS2D

GS2D

GS2M

GS2M

GS2S

GS2S

GS2S(d)

GS3M

GS3M

GS3M(d)

GS3S

GS3S

GS4D

GS4D

GS4M

GS4M

06-06-96

05-02-96

05-01-96

05-13-96

05-01-96

06-13-96

08-21-95

06-13-96

06-04-96

08-08-95

05-21-96

08-11-95

05-23-96

08-10-95

05-23-96

08-10-95

05-23-96

08-09-95

06-05-96

08-09-95

06-05-96

08-09-95

06-05-96

06-05-96

08-18-95

05-22-96

05-22-96

08-17-95

05-22-96

08-17-95

05-21-96

08-16-95

05-21-96

<0.20

<20

<20

<.20

<.20

<20

<.20

<.20

<.20

<.20

<20

<20

<20

<.20

<20

<.20

<20

0.20

<20

0.30

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<0.20

<.20

<20

<.20

<.20

<20

<.20

<.20

<.20

<20

<20

<.20

<20

<.20

<.20

<.20

<20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<0.30 <0.10

<.30 <10

<.30 <10

<30 <.10

<30 <.10

<.30 <.10

<30 <10

<30 <.10

<.30 <.10

<.30 <.10

<.30 <.10

<.30 <.10

<.30 <.10

<.30 0.11

<.30 <.10

<.30 <.10

<.30 <10

<.30 0.11

<.30 <.10

<.30 <.10

<.30 <.10

<.30 <.10

<.30 <.10

<.10

<.30 <.10

<.30 <.10

<10

<.30 0.12

<.30 <.10

<.30 <.10

<.30 <.10

<.30 <.10

<.30 <.10

<0.005

<.005

<.005

<005

<.005

<.005

<.005

<005

<.005

<.005

<.005

<.005

<.005

<005

<.005

<005

<.005

<.005

<.005

<.005

<.005

<.005

<005

<.005

<.005

<.005

<.005

<.005

<.005

<.005

<.005

<.005

<.005

<0.030

<.030

<.030

<.030

<.030

<.030

<.030

<030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<0.040

<.040

<.040

<.040

<.040

<.040

0.090

0.10

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.040

<.040

<.040

<.040

<040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<0.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<030

<030

<.030

<.030

<.030

<.030

<030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.03()

<.030

<.030

<.030

<.03()

-

0.48

0.01

0.06

0.25

0.35

36.48

20.08

0.00

0.01

17.00

12.37

17.81

15.84

1.07

12.60

3.76

6.12

5.81

6.72

7.96

8.02

6.99

-

0.00

0.00

-

39.00

16.16

3.35

4.75

5.92

8.96

52
Iron, 

field, 

(mg/L 

as 

Fe+2)

Lead, 

(Mg/L 

asPb)

Manganese,

as Mn)

Mercury,

asHg)

MolybdenLas 

Mo)

METALS

Nickel, 

asNi)

Selenium,

asSe)

Silver, 

as Ag)

Thallium,

asTl)

Vanadium,

asV)

Zinc, 

asZ)

Sample 

identification 

number

GROUND- WATER SAMPLES-CONTINUED

1.36

0.52

0.05

0.05

0.24

0.34

12.9

19.68

0.02

0.02

15.80

8.09

8.41

10.03

1.09

9.11

3.12

2.62

4.32

4.25

7.76

5.00

6.68

-

0.00

0.00

--

33.90

12.56

3.34

1.70

5.31

1.77

O.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

0.17

0.017

0.010

0.013

0.036

0.026

1.4

1.4

<.010

0.050

0.065

0.74

0.88

0.22

0.022

0.10

0.029

0.064

0.048

0.052

0.052

0.063

0.059

0.035

<.010

<.010

<.010

0.47

0.26

0.092

O.OS1

0.050

0.053

0.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.C)02

<.002

<.002

O.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

O.040

<.040

<.040

<.040

<.040

<.040

0.041

0.055

<.040

<.040

<.040

0.064

<.040

<.040

<.040

<.040

<.040

0.043

<.040

0.040

<-040

<.040

<.040

<.040

<040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.040

0.40

<.40

<.40

<.40

<40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

O.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.040

<040

<040

<.040

<.040

<.040

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

O.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

0.019

0.015

O.010

0.013

0.033

0.025

<.010

<.010

0.011

<.010

<.010

<.010

<.010

<.010

<010

0.014

<.010

0.025

0.023

0.035

0.027

<.010

<.010

<.010

0.024

0.033

0.024

<.010

<.010

<.010

<.010

<.010

<.010

DM102D

DM107D

DM107S

DM108D

DM108S

DM110D

DM110S

DM1 10S

DM113D

DM113S

DM117D

GS1D

GS1D

GS1M

GS1M

GS1S

GS1S

GS2D

GS2D

GS2M

GS2M

GS2S

GS2S

GS2S(d)

GS3M

GS3M

GS3M(d)

GS3S

GS3S

GS4D

GS4D

GS4M

GS4M

53
Table 5. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May - July 1996, and August 1996, for inorganic

constituents Continued

METALS

Sample 

identification 

number

Sample 

date

Aluminum, 

(Hg/Las 

Al)

Antimony, 

(Hg/Las 

Sb)

Arsenic, 

As)

r, Cad'

Banum, 

n mium,

"a"" '"gi"

Chromium,

Cr)

Cobalt, 

Co)

Copper,

((Ag/Las 

Cu)

Iron, 

field, 

(mg/Las

GROUND- WATER SAMPLES-CONTINUED

GS4S

GS4S

GSCP3D

GSCP3M

GSCP4M

GSCP5M

GSCP5M(d)

GSCP6D

GSCP8

GSCP9S

MW11

MVH8

MW.9

MW19

MW19

MW20

MW206D

MW206D

MW206D(d)

MW206M

MW206M

MW21

MW226D

MW226M

MW226M

MW227D

MW227D

MW227S

MW37D

MW37S

MW37S(d)

MW37S

MW39D

08-16-95

05-20-95

06-11-96

06-11-96

06-11-96

06-07-96

06-07-96

06-10-96

07-11-96

06-12-96

08-22-95

08-03-95

08-08-95

08-08-95

05-17-96

07-28-95

08-01-95

05-31-96

05-31-96

07-08-95

05-30-96

07-25-95

08-02-95

08-02-95

06-06-96

08-22-95

05-02-96

05-06-96

07-27-95

08-07-95

08-04-95

05-28-96

08-01-95

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<30

<.30

<.30

<.30

<.30

<.30

<.30

-

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.30

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 0.0053

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

0.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.10 <.005

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

6.47

7.29

0.04

10.12

4.54

4.72

-

6.64

2.09

0.31

1.20

0.00

2.05

0.28

1.45

3.30

0.01

0.01

-

0.33

1.04

2.35

0.00

0.29

0.24

0.00

0.03

2.12

0.00

0.49

-_

0.61

0.01

54
Iron, 

field, 

(mg/L 

as 

Fe+2)

5.99

1.72

0.03

9.72

4.30

5.07

--

6.51

2.00

0.00

1.17

0.01

1.85

0.27

1.23

0.12

0.00

0.01

--

0.29

0.76

1.16

0.00

0.23

0.23

0.00

0.00

2.05

0.00

0.41

--

0.06

-

Lead, 

asPb)

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

Manganese,

as Mn)

0.056

0.057

0.028

0.048

0.050

0.060

0.060

0.062

0.066

0.053

0.076

<.010

0.032

<.010

0.025

0.046

<.010

<.010

<.010

0.036

0.034

<.010

<.010

0.019

0.017

<.010

<.010

0.099

<.010

0.17

0.19

0.16

<.010

Mercury,

asHg)

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

MolybdenLas 

Mo)

METALS

Nickel, 

asNi)

Selenium,

asSe)

Silver, 

as Ag)

Thallium,

asTl)

GROUND- WATER SAMPLES-CONTINUED 

<.040 <.040 <.40 <.040 <5.0

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.()40

<.040

<.040

<.040

<.040

<.040

<.040

<.040

0.050

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

Vanadium,

asV)

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

Zinc, 

as Z)

<.010

<.010

0.020

<.010

<.010

0.035

0.036

0.032

0.029

0.011

<.010

<.010

<.010

<.010

<.010

0.017

0.012

0.016

0.013

0.017

<.010

<.010

<.010

<.010

0.013

0.024

0.017

<.010

0.057

0.011

0.013

<.010

0.024

Sample 

identification 

number

GS4S

GS4S

GSCP3D

GSCP3M

GSCP4M

GSCP5M

GSCP5M(d)

GSCP6D

GSCP8

GSCP9S

MW11

MW18

MW19

MW19

MW19

MW20

MW206D

MW206D

MW206D(d)

MW206M

MW206M

MW21

MW226D

MW226M

MW226M

MW227D

MW227D

MW227S

MW37D

MW37S

MW37S(d)

MW37S

MW39D

55
Table 5. Ground- and surface-water quality data at tiie natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May - July 1996, and August 1996, for inorganic

constituents Continued

Sample 

identification 

number

Sample 

date

Aluminum,

Al)

Antimony, 

(Hg/Las 

Sb)

METALS

Arsenic, Barium. 

As) Ba)

Cadmium,

(Hg/Las 

Cd)

Chromium,

(fig/Las 

Cr)

Iron, 

field, 

Cobalt, Copper, (mg/Las 

(Hg/Las (ng/Las Fe+2+ 

Co) Cu) Fe+3)

GROUND- WATER SAMPLES-CONTINUED

MW39D(d) 

MW39S

MW39S

MW40D

MW40S

MW41D

MW41S

MW43S

MW43S(d)

MW61S

MW61S

MW62D

MW62S

MW64D

MW64S

MW64S(d)

MWD4B

08-01-95 

07-26-95

06-12-96

08-03-95

08-03-95

07-31-95

08-01-95

07-26-95

07-26-95

08-04-95

06-21-96

06-21-96

06-18-96

07-11-96

06-14-96

06-14-96

05-31-96

<.20 

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20 

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.30 <.10 

<.30 <10

<.30 <10

<.30 <10

<.30 <.10

<.30 <.10

<.30 <.10

<.30 <10

<.10

<.30 0.32

<.30 0.36

<.30 <.10

<.30 <10

<.30 <.10

<.30 <.10

<.30 <10

<.30 <.10

<.005 

<.005

<.005

<.005

<.005

<.005

<.005

<.005

<005

<.005

<.005

<.005

<005

<.005

<.005

<.005

<.005

<030 

<.030

<.030

<.030

<.030

<.030

<030

<030

<.030

<030

<.030

<.030

<.030

<.030

<.030

<.030

<.030

<.040 <.030 

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

<.040 <.030

0.07

0.00

0.00

0.00

0.01

1.73

3.62

--

17.52

18.2

0.00

5.96

-

9.24

0.00

SURFACE-WATER SAMPLES

GS1SW

GS1SW

GS2SW

GS2SW

GS3SW

GS3SW

GS4SW

GS4SW(d)

GS4SW

OS -10-95

05-23-96

OS- 10-95

06-05-96

OS- 17-95

05-22-96

OS- 16-95

06-14-96

05-20-96

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.30 <10

<.30 <10

<.30 0.15

<.30 <10

<.30 <.10

<.30 <.10

<.30 <10

<.30 <.10

<.30 <10

<005

<.005

<.005

<005

<.005

<.005

<.005

<.005

<.005

<030

<.030

<030

<.030

<030

<.030

<.030

<.030

<.030

<.040 <.030

<040 <.030

0.069 <.030

<.040 <.030

<.040 <.030

<.040 <.030

2.64

0.18

6.23

0.18

0.56

0.39

<.040 <.030 0.32

<.040 <.030 0.32

<.040 <.030 0.32

QUALITY-ASSURANCE SAMPLES

Eq. Blank (1)

Eq. Blank (2)

Eq. Blank (3)

Eq. Blank (4)

Eq. Blank (5)

Eq. Blank (6)

07-27-95

OS-02-95

08-03-95

08-09-95

08-11-95

08-16-95

<.20

<20

<.20

<.20

<20

<.20

<.20

<.20

<.20

<,?0

<20

<.20

<.30 <10

<30 <.10

<.30 <.10

<.30 <.10

<.30 <10

<.30 <.10

<.005

<.005

<.005

<.005

<.005

<005

<.030

<.030

<.030

<030

<.030

<.030

<040 <.030

<.040 <.030

<040 <.030

<.040 <.030

<040 <.030

<.040 <.030 -

56
Iron, 

field, 

(mg/L 

as

Lead, 

(Hg/L 

asPb)

Manganese,

as Mn)

Mercury,

asHg)

MolybdenL as 

Mo)

METALS

Nickel,

asNi)

Selenium,

asSe)

Silver, 

as Ag)

Thallium,

asTl)

Vanadium,

asV)

Zinc, 

asZ)

Sample 

identification 

number

GROUND- WATER SAMPLES-CONTINUED

--

0.08

0.00

-

0.00

0.01

1.61

2.80

--

10.85

16.84

0.00

5.68

-

8.84

-

0.00

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<20

<.20

<.20

<.20

<.010

0.016

<.010

<.010

<.010

<.010

0.029

0.052

0.053

0.37

0.40

<.010

0.055

0.057

0.44

0.44

0.015

<-002

<.002

<.002

<.002

<.002

<-002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

0.025

0.018

<.010

0.012

<.010

<.010

<.010

0.034

0.035

<.010

<.010

0.016

0.016

0.018

0.020

0.014

<.010

MW39D(d)

MW39S

MW39S

MW40D

MW40S

MW41D

MW41S

MW43S

MW43S(d)

MW61S

MW61S

MW62D

MW62S

MW64D

MW64S

MW64S(d)

MWD4B

SURFACE-WATER SAMPLES

0.13

0.11

3.25

0.12

0.03

0.04

0.02

--

0.13

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

<.20

0.16

0.07S

1.2

0.035

0.07S

0.14

0.23

0.23

0.097

<.002

<-002

<.002

<-002

<.002

<.002

<.002

<.002

<.002

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.010

<.010

0.18

<.010

0.013

0.029

<.010

<.010

<.010

GS1SW

GS1SW

GS2SW

GS2SW

GS3SW

GS3SW

GS4SW

GS4SW(d)

GS4SW

QUALITY-ASSURANCE SAMPLES

--

-

-

--

-

<.20

<.20

<.20

<.20

<.20

<.010

<.010

<.010

<.010

<.G10

<.002

<002

<.002

<.002

<.002

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.40

<.40

<.40

<.40

<.40

<.040

<.040

<.040

<.040

<.040

<5.0

<5.0

<5.0

<5.0

<5.0

<.040

<.040

<.040

<.040

<.040

<.010

<.010

<.010

<.010

<.010

Eq. Blank (1)

Eq. Blank (2)

Eq. Blank (3)

Eq. Blank (4)

Eq. Blank (5)

<.20 <.010 <.002 <.040 <.40 <.040 <5.0 <.040 <.010 Eq. Blank (6)

57
Table 5. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, July - August 1995, May - July 1996, and August 1996, for inorganic

constituents Continued

Sample

identification

number

METALS

Sample 

date

Aluminum, 

(Hg/Las 

Al)

Antimony,

(Hg/Las

Sb)

Arsenic, Barium,

(yg/Las (jog/Las

As) Ba)

Cad- Chromium, mium, 

(Hg/Las (ng/Las 

Cd) Cr)

Iron, 

field,

Cobalt, Copper, (mg/Las 

(Mg/Las (ng/Las Fe*2+

Co) Cu) «

Fe)

QUALITY-ASSURANCE SAMPLES-CONTINUED

Eq. Blank (7) 08-16-95 <.20 <.20 <.30 <.10 <.005 <.030 <.040 <.030 

Eq. Blank (8) 08-18-95 <.20 <.20 <.30 <.10 <.005 <.030 <.040 <030 

Eq. Blank (9) 08-22-95 <.20 <20 <.30 <.10 <.005 <.030 <.040 <030 

Eq. Blank (10) 05-01-96 <.20 <20 <.30 <.10 <.005 <.030 <.040 <030 

Eq. Blank(ll) 05-21-96 <.20 <.20 <30 <.10 <.005 <.030 <.040 <030

Eq. Blank(12) 

Eq. Blank (13) 

Eq. Blank (14) 

Eq. Blank (15) 

Eq. Blank(16)

05-22-96

05-30-96

06-05-96 

06-12-96 

06-13-96

<.20 

<.20 

<.20 

<.20 

<.20

<20 

<.20 

<.20 

<.20 

<.20

<.30 

<.30 

<.30 

<.30 

<.30

<.005 

<.005 

<.005 

<.005 

<.005

<.030 

<.030 

<.030 

<.030 

<.030

<.040 

<.040 

<.040 

<.040 

<.040

<030 

<.030 

<030 

<.030 

<030

Eq. Blank (17) 06-14-96 <.20 <.20 <-30 <.005 <.030 <.040 <030

58
Iron,

field, 

, n Lead,

(mg/L / n (W5/L

., as Pb) Fe+2 )

Manganese, 

(H8/L 

as Mn)

Mercury, 

(M8/L 

asHg)

MolybdenLas 

Mo)

METALS

Nickel,

(M8/L 

asNi)

Selenium,

asSe)

Silver, 

asAg)

Thallium,

asTl)

Vanadium,

asV)

Zinc, 

asZ)

Sample 

identification 

number

QUALITY-ASSURANCE SAMPLES-CONTINUED

<.20

<.20

<20

<20

<.20

<.20

<20

<.20

<20

<.20

<.20

<010

<.010

<.010

<010

<.010

<.010

<.010

<.010

<.010

<.010

<.010

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<.002

<040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.40

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<040

<.040

<.040

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<5.0

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

<.040

0.016

<.010

<.010

<.010

<.010

<.010

<.010

<.010

<.010

<.010

<.010

Eq.

Eq.

Eq.

Eq.

Blank (7)

Blank (8)

Blank (9)

Blank (10)

Eq. Blank (11)

Eq.

Eq.

Eq.

Eq.

Eq.

Eq.

Blank (12)

Blank (13)

Blank (14)

Blank (15)

Blank (16)

Blank (17)

59
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbo

[Locations of sample siles shown in figures 5-6; mg/L, milligrams per liter; ng/L, micrograms per liter; --, no data; (d), quality-control duplicate sample; q

blank, equipmenl blank; Am. blank, ambient blank; August, 1996 samples were analyzed by USGS personnel; all others were analyzed by a contract labor

Sample 

identification 

number

DM101D

DM102D

DM102D

DM107D

DM107D

DM107S

DM108D

DM108D

DM108S

DM109D

DM110D

DM110D

DM110S

DM110S

DM110S

DM 11 3D

DM 11 3D

DM113S

DM117D

GS1D

GS1D

GS1M

Sample 

dale

08-03-96

06-06-96

08-02-96

05-02-96

08-02-96

05-01-96

05-13-96

08-02-96

05-10-96

08-03-96

06-13-96

08-03-96

08-21-95

06-13-96

08-03-96

06-04-96

08-02-96

08-08-95

05-21-96

08-11-95

05-23-96

08-10-95

Sample 

time

..

11:00

-

10:00

-

15:30

11:30

-

12:00

--

10:00

-

12:00

12:00

-

15:00

14:30

15:00

10:00

13:00

13:00

Carbon, Bromo- 4-Bromo- 

. _, Bromo- .... _ Bromo- Chloro- Chl

total, Benzene , dichloro- nouro- . 

.. , . methane . . form benzene eth

disolved (ug/L) , . methane benzene

i i\\ ^^ (, tan\ r,,o/M (^L) (^g/L) (^g

(mg/L) (Hg/L) (Hg/L)

GROUND- WATER SAMPLES 

38.3

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

43.2

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

94.9

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 -<1

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

97.6

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

76.6

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

97.2

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 <1.0 <1.0 <1.0 61 <1

1,187.6

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

72.6

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Cou

May - July 1996, and August 1996, sampling for organic constituents and total dissolved carbon 

Sample 

identification 

number

GS1M

GS1S

GS1S

GS2D

GS2D

GS2M

GS2M

GS2S

GS2S

GS3M

GS3M

GS3M(d)

GS3S

GS3S

GS4D

GS4D

GS4M

GS4M

GS4S

GS4S

GSCP3D

GSCP3D

GSCP3M

GSCP3M

Sample 

date

05-23-96

08-10-95

05-23-96

08-09-95

05-06-96

08-09-95

06-05-96

08-09-95

06-05-96

08-18-95

05-22-96

05-22-96

08-17-95

05-22-96

08-17-95

05-21-96

08-16-95

05-21-96

08-16-95

05-20-96

06-11-96

08-02-96

06-11-96

08-02-96

Carbon, Bromo- 4-Bromo- _ 

. ID Bromo- Bromo- Chloro- Chlo

Sample total, Benzene dichloro- nouro- 

.... . n x methane , form benzene etha

time di solved (Mg/L) , _ , methane benzene , , .

(mg/L) ^ (Mg/L) (Mg/U (Mg/L) (W/L) (W!

GROUND- WATER SAMPLES-CONTINUED 

11:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

11:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

08:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

11:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

08:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

10:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

11:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

08:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

16:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

09:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

14:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

15:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

14:00 2.6 <1.0 <1.0 <1.0 <1.0 <1.0 <1

08:00 2.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

09:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

12:30 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

12:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

09:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

13:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

09:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

16.2

11:00 - 3.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1

97.7
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Coun

May - July 1996, and August 1996, sampling for nrganic constituents and total dissolved carbon 

Sample 

identification 

number

GSCP4M

GSCP4M

GSCP5M

GSCP5M(d)

GSCP5M

GSCP6D

GSCP6D

GSCP8

GSCP9S

GSCP9S

MW11

MW18

MW19

MW19

MW19

MW19

MW20

MW206D

MW206D

MW206D(d)

MW206M

MW206M

MW206M

MW21

Sample 

date

06-11-96

08-02-96

06-07-96

06-07-96

08-02-96

06-10-96

06-07-96

07-11-96

06-12-96

08-03-96

08-22-95

08-03-95

08-08-95

08-08-95

05-17-96

08-03-96

07-28-95

08-01-95

05-31-96

05-31-96

08-07-95

05-30-96

08-03-96

07-27-95

Carbon, _ Bromo- 4-Bromo- _ . . _, , 

, _ Bromo- .. , , .. Bromo- Chloro- Chloro

Sample total, Benzene , dichloro- nouro- _ , , 

.... . . methane , , form benzene ethan

time disolved (ug'L) , . methane benzene , . 

(iig/L) _ _. (ug/L) (fig/L) (|ig/L

(mg/L) (|ig/L) (|ig/L)

GROUND- WATER SAMPLES-CONTINUED

116.0

09:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:30 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

H3.3

13:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

88.3

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

16:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

154.0

13:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

14:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

12:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

104.6

09:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:45 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

15:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

114.4

13:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Coun

May - July 1996, and August 1996, sampling for organic constituents and total dissolved carbon 

Sample 

identification 

number

MW226D 

MW226M

MW226M

MW226M

MW227D

MW227D

MW227D

MW227S

MW37D

MW37S

MW37S(d)

MW37S

MW37S

MW39D

MW39D(d)

MW39S

MW39S

MW39S

MW40D

MW40S

MW41D

MW41S

MW43S

MW43S(d)

Sample 

date

08-02-95 

08-02-95

06-06-96

08-02-96

05-02-96

08-22-95

08-02-96

05-06-96

07-27-95

08-07-95

08-07-95

05-28-96

08-02-96

08-01-95

08-01-95

07-26-95

06-12-96

08-02-96

08-03-95

08-03-95

07-31-95

08-01-95

07-26-95

07-26-95

Carbon, Bromo- 4-Bromo- 

_ . i r, Bromo- .... ._ Bromo- Chloro- Chlor

Sample total, Benzene dichloro- nouro- 

. , . . , f n \ methane , , form benzene ethan

time di solved (ug/L) , . methane benzene , _ x

(mg/L) WV (ng/L) (Mg/L) (^8/L) (Mg/L) (^8/L

GROUND-WATER SAMPLES-CONTINUED 

08:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

09:00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

89.1

13:30 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

84.0

12:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

11:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

11:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

14:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

91.0

11:00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

15:00 -- 37 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

14:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

122.7

08:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

13:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

10:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May- July 1996, and August 1996, sampling for organic constituents and total dissolved carbo

Sample 

identification 

number

MW61S

MW61S

MW61S

MW62D

MW62S

MW62S

MW64D

MW64S

MW64S(d)

MWD4B

GS1SW

GS1SW

GS2SW

GS2SW

GS2SW(d)

GS3SW

GS3SW

GS4SW

GS4SW(d)

GS4SW

Eq. blank (1)

Eq. blank (2)

Eq. blank (3)

Eq. blank (4)

Sample 

date

08-04-95

06-21-96

08-03-96

06-18-96

06-18-96

08-03-96

07-11-96

06-14-96

06-14-96

05-31-96

08-10-95

05-23-96

08-10-95

06-05-96

05-06-96

08-17-95

05-22-96

08-16-95

08-16-95

05-20-96

07-27-95

08-02-95

08-03-95

08-09-95

Carbon, _ Bromo- 4-Bromo- _ _. , . 

_ . in Bromo- Bromo- Chloro- Ch

Sample total, Benzene , dichloro- nouro- 

.... , . methane form benzene eth

time disolved (ug/I-) , ,. methane benzene . 

fmo/i ^ (V&L) i ta n\ i n\ (Mg/L) (Mg/L) (M

(mg/L) (Mg/L; (Mg'L)

GROUND-WATER SAMPLES-CONTINUED 

09:00 -- 6.5 <1.0 <1.0 <1.0 <1.0 87 <

12:00 -- 7.8 <1.0 <1.0 <1.0 <1.0 82 <

1,421.2

11:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

13:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

163.5

14:00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

10:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

10:45 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

15:00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

SURFACE-WATER SAMPLES

10:15 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

14:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

10:45 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

15:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

15:45 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

15:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

13:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

13:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

14:00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

QUALITY-ASSURANCE SAMPLES

13:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

09:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

09:30 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

15:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Cou

May - July 1996, and August 1996, sampling for organic constituents and total dissolved carbon 

Sample 

identification 

number

Eq. blank (5)

Eq. blank (6)

Eq. blank (7)

Eq. blank (8)

Eq. blank (9)

Eq. blank (10)

Eq. blank (11)

Eq. blank (12)

Eq. blank (13)

Eq. blank (14)

Eq. blank (15)

Eq. blank (16)

Eq. blank (17)

Trip blank (1)

Trip blank (2)

Trip blank (3)

Trip blank (4)

Trip blank (5)

Trip blank (6)

Trip blank (7)

Trip, blank (S)

Am. blank (1)

Am. blank (2)

Sample 

date

08-11-95

08-16-95

08-16-95

08-18-95

08-22-95

05-02-96

05-21-96

05-22-96

05-30-96

06-05-96

06-12-96

06-13-96

06-14-96

07-26-95

07-27-95

08-04-95

08-09-95

08-11-95

08-17-95

08-18-95

08-21-95

08-07-95

05-31-96

Carbon, _ Bromo- 4-BromoBromo- .... _ Bromo- Chloro- Chlor

Sample total, Benzene , dichloro- flouro- 

. . . . . . . methane , , form benzene ethan

time disolved (ng/L) , n » methane benzene / n \ n \ i n 

(mg/L) (H&/L) (H&/L)

QUALITY-ASSURANCE SAMPLES-CONTINUED

12:00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

14:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

10:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

14:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

10:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

09:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

13:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

16:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

14:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

15:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 2.4

11:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

10:00 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

13:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

08:45 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

10:30 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

08:30 - <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

09:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

08:30 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

11:30 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

11:45 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.

09:00 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbo

[Locations of sample sites shown in figures 5-6; ng/L, micrograms per liter; , no data; (d), quality control duplicate sample; quality-assurance samples ar

Amb. blank, ambient blank; August, 1996 samples, ethane, ethylene, and methane samples were analyzed by USGS personnel, all others were analyzed by 

ON 

ON

Sample 

identification 

number

DM101D

DM102D

DM102D

DM107D

DM107D

DM107S

DM108D

DM108D

DM108S

DM109D

DM110D

DM110D

DM1 IOS

DM110S

DM1 IOS

DM113D

DM113D

DM113S

DM117D

GS1D

GS1D

GS1M

Sample 

date

08-03-96

06-06-96

08-02-96

05-02-96

08-02-96

05-01-96

05-13-96

08-02-96

05-10-96

08-03-96

06-13-96

08-03-96

08-21-95

06-13-96

08-03-96

06-04-96

08-02-96

08-08-95

05-21-96

08-11-95

05-23-96

08-10-95

transi i rv i T rv i i n> 1,2-Di- cis- trans- 1,2-Di- "^ ~ 1,3- 

1,1-Di- 1.2-Di- 1,1-Di- Di- 

., ,, ,. chloro- l,2Di- 1,2-Di- chloro- .. Dichloro- chloro- chloro- , , , , , chloro- , , 

ethene, chloro- chloro- pro- chloroethane ethane ethene . , , pro- 

, ,, total ethene ethene pane pro- 

(HB/L) (HB/L) (HB/L) ^ ^ ^ ^ pen* pene

GROUND-WATER SAMPLES

<0.97 - <0.97 <0.97

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0

<0.97 - <0.97 <0.97

<!.() 6.3 <1.0 -- 4.5 <1.0 <1.0 <1.0 <1.0

<0.97 -- 11.63 <1.0

<1.0 2.5 <1.0 - 2.1 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 - 15.0 <1.0 <1.0 <1.0 <1.0

<0.97 29.082 <0.97

<1.0 <1.0 <1.0 - 17.0 <1.0 <1.0 <1.0 <1.0

<0.97 <0.97 <0.97

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0

<0.97 - <0.97

<1.0 <1.0 <1.0 2,000 ~ <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 1400 <1.0 <1.0 <!.() <1.0

<0.97 155.60 35.09

<1.0 <1.0 <1.0 - <!.() <1.0 <1.0 <1.0 <1.0

<0.97 <0.97 <0.97

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0

<1.0 <!.() <1.0 - - -- <!.() <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0

<!.(» <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <!.()

Ethane 

(Hg/L) 

-

ND 

-

-

-_

-

ND 

.-

0.55 

0.36 

-

<0.34 

-

ND 

ND 

ND 

ND 

ND 
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Cou

May - July 1996, and August 1996, for organic constituents and total dissolved carbon Con

Sample 

identification 

number

GS1M

GS1S

GS1S

GS2D

GS2D

GS2M

GS2M

GS2S

GS2S

GS3M

GS3M

GS3M(d)

GS3S

GS3S

GS4D

GS4D

GS4M

GS4M

GS4S

GS4S

GSCP3D

GSCP3D

GSCP3M

GSCP3M

Sample 

date

05-23-96

08-10-95

05-23-96

08-09-95

05-06-96

08-09-95

06-05-96

08-09-95

06-05-96

08-18-95

05-22-96

05-22-96

08-17-95

05-22-96 '

08-17-95

05-21-96

08-16-95

05-21-96

08-16-95

05-20-96

06-11-96

08-02-96

06-11-96

08-02-96

trans-

. _. . . _. , ^. 1,2-Di- cis- trans- 1,2-Di- ".' 1,3- 

1 -D,- 12-D,- U-D,- cWoro . cWor(> D.- D.

cnloro- chloro- chloro- , . , , . cnloro- , , 

. . , ethene, chloro- chloro- pro- chloroethane ethane ethene . , pro- 

..... , . . ,. . total ethene ethene pane proOig/L) (MB/D (Mg/L) (Mg/L) (|ig/L) (ws/L) (Mg/L) £-, ^

GROUND- WATER SAMPLES-CONTINUED

<1.0 <1.0 <1.0 <1.0 -- - <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 110 -- <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 29.0 <1.0 <1.0 <1.0 <1.0

<1.0 63 <1.0 17 <1.0 <1.0 <1.0

<1.0 68 <1.0 -- 13.0 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0

<l.O <1.0 <1.0 5.7 -- - <1.0 <1.0 <1.0

<l.O <1.0 <1.0 -- 33.0 <1.0 <1.0 <1.0 <1.0

<l.O <1.0 <l.O 3.3 -- <1.0 <1.0 <1.0

<1.0 <1.0 <l.O -- 1.6 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 -- 1.7 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 11 - <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 8.8 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 1.3 -- <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 - -- <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0

<1.0 <1.0 <1.0 -- 2.6 <1.0 <1.0 <1.0 <1.0

<0.97 <0.97 <0.97

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0

<0.97 <0.97 <0.97

Ethane 

(Mg/L) 

ND 

ND 

ND 

ND 

ND 

ND 

ND 

ND 

ND 

ND 

1.47 

<0.37 

ND 

ND 

ND 

ND 

ND 

ND 

ND 

..

ND 

..
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbon-Co

Sample 

ideniificaiion 

number

GSCP4M

GSCP4M

GSCP5M

GSCP5M(d)

GSCP5M

GSCP6D

GSCP6D

GSCP8

GSCP9S

GSCP9S

MW11

MW18

MW19

MW19

MW19

MW19

MW20

MW206D

MW206D

MW206D(d)

MW206M

MW206M

MW206M

MW21

Sample 

date

06-11-96

OS-02-96

06-07-96

06-07-96

08-02-96

06-10-96

06-07-96

07-11-96

06-12-96

08-03-96

08-22-95

08-03-95

08-08-95

08-08-95

05-17-96

08-03-96

07-28-95

OS-01-95

05-31-96

05-31-96

08-07-95

05-30-96

08-03-96

07-27-95

. trans-

, - r^- , , T^- ll-D\- cis- trans- 1,2-Di- C1S".' " 1,3- 

1,1-Di- 1,2-Di- 1,1-Di- ' ' Di- '. 

' ' ' chloro- 1,2 Di- 1,2-Di- chloro- ., Di- ^ , 

chloro- chloro- chloro- chloro- , . Ethane 

, ethene, chloro- chloro- pro- chloroethane ethane ethene , . . pro- (Uft/L) 

, x , n . / /, * total ethene ethene pane r pro- 

(Mg/L) (MB/L) (MB^> (W/L) ( ^ (^L) ^ Pene 

(H&/L) (ng/L)

GROUND- WATER SAMPLES-CONTINUED

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 ND 

6.69 <0.97 5.72

<1.0 <1.0 <1.0 -- 5.3 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 - - - <1.0 <1.0 <1.0 - 

<0.97 12.99 <0.97

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 ND 

<0.97 - <0.97 <0.97

<1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 - 2.5 <1.0 <1.0 <1.0 <1.0 ND 

<0.97 <0.97 25.98

<1.0 <1.0 <1.0 46 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 <1.0 -- - <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 4.8 -- -- <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 1.1 -- <1.0 <1.0 <1.0 -- 

<1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 ND 

<0.97 8.72 <0.97

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 - 

<1.0 <1.0 <1.0 1.3 ~ -- <1.0 <1.0 <1.0 -- 

<1.0 <1.0 <1.0 -- 5.1 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 5.0 -- <1.0 <1.0 <1.0 

<1.0 15 <1.0 13 - -- <1.0 <1.0 <1.0 ND 

<1.0 19 <1.0 -- 17.0 <1.0 <1.0 <1.0 <1.0 ND 

<0.97 36.934 <0.97

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 - 
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Cou

May - July 1996, and August 1996, for organic constituents and total dissolved carbon-Con

Sample 

identification 

number

MW226D

MW226M

MW226M

MW226M

MW227D

MW227D

MW227D

MW227S

MW37D

MW37S

MW37S(d)

MW37S

MW37S

MW39D

MW39D(d)

MW39S

MW39S

MW39S

MW40D

MW40S

MW41D

MW41S

MW43S

MW43S(d)

trans-

, , _. . _ ^. , , T-Y- 1,2-Di- cis- trans- 1,2-Di- ".' 1,3- 

1,1-Di- 1,2-Di- 1,1-Di- ' Di- '. 

. ., ., ., chloro- 1,2 Di- 1,2-Di- chloro- ,, Di- ^, 

Sample chJoro- chloro- chloro- chloro- , , Ethane 

, . . . ethene, chloro- chloro- pro- chloro- , 

date ethane ethane ethene pro- (ue/L) 

n f n \ t 11 \ lotai ethene ethene pane pro- 

(ug/L) (ug/L) (ug/L) . _. pene, 

(ug/L) 

(ug/L)

GROUND-WATER SAMPLES-CONTINUED

08-02-95 <1.0 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 -- 

08-02-95 <1.0 <1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 -- 

06-06-96 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 ND 

08-03-96 -- - <0.97 <0.97 <0.97

08-22-95 <1.0 <1.0 <1.0 11 -- -- <1.0 <1.0 <1.0 ND 

05-02-96 <1.0 <1.0 <1.0 -- 7.4 <1.0 <1.0 <1.0 <1.0 -- 

08-02-96 - -- <0.97 - <0.97 <0.97

05-06-96 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 -- 

07-27-95 <1.0 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 - 

08-07-95 <1.0 <1.0 <1.0 1.5 -- -- <1.0 <1.0 <1.0 ND 

08-07-95 <1.0 <1.0 <1.0 1.4 - - <1.0 <1.0 <1.0 - 

05-28-96 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 -- 

08-02-96 - - <0.97 - <0.97 <0.97

08-01-95 <1.0 <1.0 <1.0 <1.0 -- -- <l.O <1.0 <1.0 - 

08-01-95 <1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 - 

07-26-95 <1.0 45 6.4 130 - -- <1.0 <1.0 <1.0 

06-12-96 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 ND 

08-02-96 - -- <0.97 -- <0.97 <0.97

08-03-95 <1.0 <1.0 <1.0 <1.0 ~ <1.0 <1.0 <1.0 

08-03-95 <1.0 <1.0 <1.0 <1.0 - -- <1.0 <1.0 <1.0 - 

07-31-95 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

08-01-95 1.3 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 -- 

07-26-95 <1.0 <1.0 <1.0 <1.0 -- - <1.0 <1.0 <1.0 ND 

07-26-95 <1.0 <1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 -- 
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbon Con

Sample 

identification 

number

MW61S

MW61S 

MW61S

MW62D

MW62S

MW62S

MW64D

MW64S

MW64S(d) 

MWD4B

GS1SW

GS1SW

GS2SW

GS2SW

GS2SW(d)

GS3SW

GS3SW

GS4SW

GS4SW(d) 

GS4SW

Eq. blank (1) 

Eq. blank (2) 

Eq. blank (3) 

Eq. blank (4)

Sample 

date

08-04-95

06-21-96 

OS-03-96

06-18-96

06-18-96

08-03-96

07-11-96

06-14-96

06-14-96 

05-31-96

05-31-96

05-23-96

OS-10-95

06-05-96

06-05-96

08-17-95

05-22-96

08-16-95

08-16-95 

05-20-96

07-27-95 

OS-02-95 

08-03-95 

08-09-95

. , , trans-

. *. r>- 1 ^ I-N- CIS-1,3- , ,

, , r.- , -, r>- , , r.- 1,2-Di- cis- trans- 1,2-Di- _. 1,3- 

1,1-Di- 1,2-Di- 1,1-Di- ' ,__. , . _. ' Di- ' 

chloro- 1,2 Di- 1,2-Di- chloro- ,. Di- , 

chloro- chloro- chloro- , , , . . chloro- . , Ethane 

... ethene, chloro- chloro- pro- chloro- , . 

ethane ethane ethene . pro- (ug/L) 

, v total ethene ethene pane pro- w 

(ug/L) (ug/L) (ug/L) _.. , n \ n \ P606, 

(HB/L) (t^g'L) (Hg'L) vMg'l') ( n \ pene

GROUND- WATER SAMPLES-CONTINUED

<1.0 <1.0 <1.0 <1.0 - -- <1.0 <1.0 <1.0 - 

<0.97 - <0.97 5.23

<1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 ND 

<0.97 - <0.97 <0.97

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 - 

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 - 

<1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 --ND 

<1.0 <1.0 <1.0 -- <1.0 -<1.0 <1.0 <1.0 <1.0 ND 

SURFACE-WATER SAMPLES

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <.37 

<1.0 <1.0 <1.0 - 2.3 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 -- 1.4 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 - 

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 ND 

<1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 <.51 

<1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 ND 

QUALITY-ASSURANCE SAMPLES
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent C

May - July 1996, and August 1996, for organic constituents and total dissolved carbon Co

Sample 

identification 

number

Eq. blank (5)

Eq. blank (6)

Eq. blank (7)

Eq. blank (8)

Eq. blank (9)

Eq. blank (10)

Eq. blank (11)

Eq. blank (12)

Eq. blank (13)

Eq. blank (14)

Eq. blank (15)

Eq. blank (16)

Eq. blank (17)

Trip blank (1)

Trip blank (2)

Trip blank (3)

Trip blank (4)

Trip blank (5)

Trip blank (6)

Trip blank (7)

Trip, blank (8)

Amb. blank (1)

Amb. blank (2)

transi i n>- i -i rv i i r-.- 1,2-Di- cis- trans- 1,2-Di- ' 1,3- 

, , i, u K ' <Woro- 1,2 Di- 1,2-Di- ch.oro- *" Di- c , 

Sample chloro- chloro- chloro- chloro- , . Ethane 

. ... ethene, chloro- chloro- pro- chloro- , . 

date ethane ethane ethene , pro- (ua/L) 

, n , i n \ i 11 \ total ethene ethene pane pro- 

(M8/L) (M8/L) (^L) (Mg/L) (Mg/L) (Mg/L) (Mg/L) /«£ pene 

(^L) (H8/L)

QUALITY-ASSURANCE SAMPLES-CONTINUED

08-11-95 <1.0 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 

08-16-95 <1.0 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 -- 

08-16-95 <1.0 <1.0 <1.0 <1.0 - -- <1.0 <1.0 <1.0 - 

08-18-95 <1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 

08-22-95 <1.0 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 

05-02-96 <1.0 <1.0 <1.0 <1.0 - - <1.0 <1.0 <1.0 - 

05-21-96 <1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 -- 

05-22-96 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 -- 

05-30-96 <1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 -- 

06-05-96 <1.0 <1.0 <1.0 - -- <1.0 <1.0 <1.0 - 

06-12-96 <1.0 <1.0 <1.0 -- - -- <1.0 <1.0 <1.0 -- 

06-13-96 <1.0 <1.0 <1.0 <1.0 -- - <1.0 <1.0 <1.0 -- 

06-14-96 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 -- 

07-26-95 <1.0 <1.0 <1.0 <1.0 -- - <1.0 <1.0 <1.0 

07-27-95 <1.0 <1.0 <1.0 <1.0 -- - <1.0 <1.0 <1.0 -- 

08-04-95 <1.0 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 -- 

08-09-95 <1.0 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 -- 

08-11-95 <1.0 <1.0 <1.0 <1.0 - -- <1.0 <1.0 <1.0 - 

08-17-95 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

08-18-95 <1.0 <1.0 <1.0 <1.0 - -- <1.0 <1.0 <1.0 - 

08-21-95 <1.0 <1.0 <1.0 <1.0 -- <1.0 <1.0 <1.0 -- 

08-07-95 <1.0 <1.0 <1.0 <1.0 - <1.0 <1.0 <1.0 -- 

05-31-96 <1.0 <1.0 <1.0 <1.0 -- -- <1.0 <1.0 <1.0 
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbo

(Locations of sample sites shown in figures 5-6; mg/L, milligrams per liter; jig/L, micrograms per liter; --, no data; (d), quality control duplicate sample; q

blank, equipment blank; Amb. blank, ambient blank, August, 1996 samples were analyzed by USGS personnel; all others were analyzed by a contract lab

Sample 

identification 

number

DM 10 ID

DM102D

DM102D

DM107D

DM107D

DM107S

DM108D

DM10SD

DM10SS

DM109D

DM110D

DM110D

DM110S

DM110S

DM110S

DM113D

DM 11 3D

DM113S

DM117D

GS1D

GS1D

GS1M

Sample 

date

08-03-96

06-06-96

08-02-96

05-02-96

08-02-96

05-01-96

05-13-96

08-02-96

05-10-96

08-03-96

06-13-96

08-03-96

08-21-95

06-13-96

08-03-96

06-04-96

08-02-96

08-08-95

05-21-96

08-11-95

05-23-96

08-10-95

1,1,2,2-

Methyl- Meth- l* ~ Tetra- 1 ' 1 '. 1 " 1 ' 1 '.2 " T

, , . _ chloro- Tri- Tnethyl- ylene- Styrene , chloro- Toluene , , , , ch

. , . , , , ethane , , .. . chloro- chloroketone chlonde (ng/L) e.hene (jxg/L) et

(Mg/L) (Mg/L) «** (Mg/L) (Mg/L) (Mg/L) (M

GROUND- WATER SAMPLES 

<1.65 - - - <

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.65 - - -- <

<1.0 <1.0 - <1.0 11 <1.0 <1.0 <1.0 

40.63 - - - 6

<1.0 <1.0 -- <1.0 6.30 <1.0 <1.0 <1.0 

<1.0 <1.0 -- 9.3 12.0 <1.0 <1.0 <1.0 

19.9 - - - 8

<1.0 <1.0 - 12 14.0 <1.0 <1.0 <1.0 

<1.65 -- -- - <

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.65 -- -- - <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 36 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.65 - -- -- <

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.65 - - -- <

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 1.7 <1.0 <1.0 <

<1.0 <1.0 - <l.O <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 470 <1.0 <1.0 <
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbon-Co

Sample 

identification 

number

GS1M

GS1S

GS1S

GS2D

GS2D

GS2M

GS2M

GS2S

GS2S

GS3M

GS3M(d)

GS3M

GS3S

GS3S

GS4D

GS4D

GS4M

GS4M

GS4S

GS4S

GSCP3D

GSCP3D

GSCP3M

GSCP3M

Sample 

date

05-23-96

08-10-95

05-23-96

08-09-95

05-06-96

08-09-95

06-05-96

08-09-95

06-05-96

08-18-95

05-22-96

05-22-96

08-17-95

05-22-96

08-17-95

05-21-96

08-16-95

05-21-96

08-16-95

05-20-96

06-11-96

08-02-96

06-11-96

08-02-96

1,1,2,2-

Methyl- Meth- tetra" Tetra- 1 ' 1 '. 1 ' 1 ' 1 '.2 ' T

, . . chloro- Tri- Tn- . . 

ethyl- ylene- Styrene chloro- Toluene chl

, , i -j , IT ^ ethane chloro- chloro- . 

ketone chlonde (M8/L) , n ^ ethene (Mg/L) . eth

, /i \ / /r ^ (Mg/L) , n , ethane ethane 

(^g/L) (Mg/L) v ^& (Mg/L) (jig

(Mg/L) (Mg/L)

GROUND- WATER SAMPLES-CONTINUED 

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 - <1.0 7.0 54 <1.0 <1.0 3

<1.0 <1.0 <1.0 35 <1.0 <1.0 <1.0 6

<1.0 2.5 -- 15 11 <1.0 <1.0 <1.0 4

<1.0 2.5 - 12 11 <1.0 <1.0 <1.0 4

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 4.2 <1.0 <1.0 <1.0 2

<1.0 <1.0 - <1.0 36 <1.0 <1.0 <1.0 9

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 - 2.6 <1.0 <1.0 <1.0 <1.0 3

<1.65 - - -- <1

<1.0 <1.0 - <1.0 <1.0 4.5 <1.0 <1.0 <

<1.65 -- - - 6
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Cou

May - July 1996, and August 1996, for organic constituents and total dissolved carbon Con

Sample 

identification 

number

GSCP4M

GSCP4M

GSCP5M

GSCP5M(d)

GSCP5M

GSCP6D

GSCP6D

GSCP8

GSCP9S

GSCP9S

MW11

MW18

MW19

MW19

MW19

MW19

MW20

MW206D

MW206D

MW206D(d)

MW206M

MW206M

MW206M

MW21

Sample 

date

06-11-96

08-02-96

06-07-96

06-07-96

08-02-96

06-10-96

06-07-96

07-11-96

06-12-96

08-03-96

08-22-95

08-03-95

08-08-95

08-08-95

05-17-96

08-03-96

07-28-95

08-01-95

05-31-96

05-31-96

08-07-95

05-30-96

08-03-96

07-27-95

1,1,2,2-

Methyl- Meth- ****' Tetra- 111 '. 1 " 111 '2 ' Tr

... . c chloro- Tn- Tnethyl- ylene- Styrene . chloro- Toluene , , . , chlo

, , , . , , ,. . ethane , . chloro- chloroketone chloride (Ug/L) , . etnene (Ug/L) ethe

{ n \ e n \ (HS/L) / n \ ethane ethane 

(H8/L) Oig/L) (M*/L) (pg/L) (w?/L) (ng/

GROUND- WATER SAMPLES-CONTINUED

7.13 -- -- -- <1.

<1.0 <1.0 - 5.9 <1.0 2.0 <1.0 <1.0 7.

<1.0 <1.0 <1.0 5.3 <1.0 1.7 <1.0 <1.0 7.

<1.65 - -- -- 20.

<1.0 <1.0 - <1.0 <1.0 <1.0 <1-0 <1.0 <1

<1.65 -- -- -- ,<1.3

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 - <1.0 <1.0 4.6 <1.0 <1.0 <1

4.48 - -- - 26.

<1.0 <1.0 - <1.0 40 <1.0 <1.0 <1.0 50

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.65 -- -- -- <1.

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 - <1.0 1.6 <1.0 <1.0 <1.0 1.

<1.0 <1.0 ~ <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1

<1.0 <1.0 - <1.0 25 <1.0 <1.0 <1.0 47

<1.0 <1.0 - <1.0 22 <1.0 <1.0 <1.0 44

35.99 - - - 56.

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <1
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbon-Co

Sample 

identification 

number

MW226D

MW226M

MW226M

MW226M

MW227D

MW227D

MW227D

MW227S

MW37D

MW37S

MW37S(d)

MW37S

MW37S

MW39D

MW39D(d)

MW39S

MW39S

MW39S

MW40D

MW40S

MW41D

MW41S

MW43S

MW43S(d)

Sample 

date

08-02-95

08-02-95

06-06-96

08-02-96

08-22-95

05-02-96

08-02-96

05-06-96

07-27-95

08-07-95

08-07-95

05-28-96

08-02-96

08-01-95

08-01-95

07-26-95

06-12-96

08-02-96

08-03-95

08-03-95

07-31-95

08-01-95

07-26-95

07-26-95

1,1,2,2-

Methyl- Meth- t.e.tra" Tetra- 1 ' U" 1 ' 1 '2 ' T

, , , C(. chloro- Tn- Tn- 

ethyl- ylene- Styrene chloro- Toluene ch

. ' . . , / /T \ ethane chloro- chloro- 

ketone chlonde vUg/Ll , _ . ethene (Ug'L) . eth

n ^ //TV (W^L) , . ethane ethane , 

(fjg/L) (fig/L) (fjg/L) (|i

GROUND- WATER SAMPLES-CONTINUED 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.65 -- - - <

<1.0 <1.0 7.4 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 -- 5.3 <1.0 <1.0 <1.0 <1.0 

17.74 -- -- - J2

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 2

<1.0 <1.0 <1.0 1.6 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.65 - - - <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 29 <1.0 <1.0 <1.0 

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.65 - - - <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent C

May - July 1996, and August 1996, for organic constituents and total dissolved carbon Co

-4

ON

Sample 

identification 

number

MW61S

MW61S

MW61S

MW62D

MW62S

MW62S

MW64D

MW64S

MW64S(d)

MWD4B

GS1SW

GS1SW

GS2SW

GS2SW

GS2SW(d)

GS3SW

GS3SW

GS4SW

GS4SW(d)

GS4SW

Eq. blank (1)

Eq. blank (2)

Eq. blank (3)

Eq. blank (4)

Sample 

date

08-04-95

06-21-96

08-03-96

06-18-96

06-18-96

08-14-96

07-11-96

06-14-96

06-14-96

05-31-96

08-10-95

05-23-96

08-10-95

06-05-96

05-06-96

08-17-95

05-22-96

08-16-95

08-16-95

05-20-96

07-27-95

OS-02-95

08-03-95

08-09-95

1,1,2,2-

,. . , », L tetra- _ 1,1,1- 1,1,2- 

Methyl- Meth- Tetra- ' . ' . 

, , . _ chloro- , , _ . Tn- Tn- . 

ethyl- ylene- Styrene chloro- Toluene ch

. . . . , , /T \ ethane . chloro- chloro- 

ketone chloride (Ug'L) , ethene (Ug'L) . . e

, n \ , /T x (ug/L) , n \ ethane ethane 

(ug/L) (ug/L) (ug/L) (|ig/L) (|lg/L) (u

GROUND- WATER SAMPLES-CONTINUED 

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.65 - -- - <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.65 - - -- <

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 

SURFACE-WATER SAMPLES

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 -- <1.0 4.3 <1.0 <1.0 <1.0 

<1.0 <1.0 -- <1.0 <1.0 0.86 <1.0 <1.0 

<1.0 <1.0 -- <1.0 2.1 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 2.1 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 - <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 -- <1.0 <1.0 <1.0 <1.0 <1.0 

QUALITY-ASSURANCE SAMPLES

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 
Table 6. Ground- and surface-water quality data at the natural-attenuation study area, Dover Air Force Base, Kent Co

May - July 1996, and August 1996, for organic constituents and total dissolved carbon Con

Sample 

ideniification 

number

Eq. blank (5)

Eq. blank (6)

Eq. blank (7)

Eq. blank (8)

Eq. blank (9)

Eq. blank (10)

Eq. blank (11)

Eq. blank (12)

Eq. blank (13)

Eq. blank (14)

Eq. blank (15)

Eq. blank (16)

Eq. blank (17)

Trip blank (1)

Trip blank (2)

Trip blank (3)

Trip blank (4)

Trip blank (5)

Trip blank (6)

Trip blank (7)

Trip, blank (8)

Am. blank (1)

Am. blank (2)

Sample 

date

08-11-95

08-16-95

08-16-95

08-18-95

08-22-95

05-02-96

05-21-96

05-22-96

05-30-96

06-05-96

06-12-96

06-13-96

06-14-96

07-26-95

07-27-95

08-04-95

08-09-95

08-11-95

08-17-95

08-18-95

08-21-95

08-07-95

05-31-96

1,1,2,2-

Methyl- Meth- I?**" Tetra- ^V" 1 ' 1 '.2" T

. , . _ chloro- Tn- Tn- 

ethyl- ylene- Styrene . chloro- loluene , . . , chl

.... , ,. , ethane . , . chloro- chloro- , 

ketone chlonde (Ug'L) , _ . etnene (Ug'L) , , eth

(UR/L) . ethane ethane 

(Ug/L) (ug/L) (ug/L) _ ... (ug

QUALITY-ASSURANCE SAMPLES-CONTINUED

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <I.O <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <

<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <
Table 7. Sample and duplicate concentrations, and relative percent differences for four volatile organic 

compounds at sites where concentrations exceeded the reporting limit, July 1995 through July 1996, Dover Air

Force Base, Kent County, Delaware

[jig/L, micrograms per liter]

Site Date Analyte

Sample

concentration

Duplicate

concentration

Relative

percent

difference

MW37S 08/07/95 l,2-Dichloroethene,total

MW37S 08/07/95 Trichloroethene

GS3M 05/22/96 cis-U-Dichloroethene

MW206D 05/31/96 cis-l,2-Dichloroethene

GS2SW 06/05/96 cis-l,2-Dichloroethene

GS2SW 06/05/96 Trichloroethene

GSCP5M 06/07/96 1,1,2,2-Tetrachloroethane

GSCP5M 06/07/96 cis-l,2-Dichloroethene

GSCP5M 06/07/96 Trichloroethene

1.5

2

1.6

5

1.4

3.1

5.3

5.3

7.6

1.4 

1.9 

1.7 

5.1 

1.4 

3.3 

5.9 

5.3 

7.6

6.9

5.1

6.1

2

0

6.2

10.7

0

0

78
Table 8. Sample and duplicate concentrations, relative percent differences, and summary statistics for methane 

samples collected from July, 1995 through July, 1996, Dover Air Force Base, Kent County, Delaware

[fig/L, micrograms per liter]

Site

MW39S

MW37D

MW21

MW206D

MW41S

MW61S

MW19

GS3S

MW206M

MW206D

GS2D

GSCP4M

GSCP3D

GSCP9S

DM110S

MW64S

MW61S

Number

Median

Maximum

Minimum

Date

07/26/95

07/27/95

07/27/95

08/01/95

08/01/95

08/04/95

05/17/96

05/22/96

05/30/96

05/31/96

06/05/96

06/11/96

06/11/96

06/12/96

06/13/96

06/14/96

06/21/96

Sample 

concentration 

Gig/L)

2,812

240

39

38

69

9,821

1,514

1,969

96

541

157

66

274

230

9,228

31

10,654

17

240

10,654

31

Duplicate 

concentration 

(Hg/L)

2,668

235

34

36

65

9,147

1,493

1,877

94

481

144

63

263

223

9,951

29

10,106

17

235

10,106

29

Relative 

percent 

difference

5.3

2.1

13.7

5.4

6

7.1

1.4

4.8

2.1

11.7

8.6

4.7

4.1

3.1

7.5

6.7

5.3

_

5.3

13.7

1.4

79
Table 9. Sample and duplicate concentrations, relative percent differences, and summary statistics for hydrogen 

samples collected in August, 1996, Dover Air Force Base, Kent County, Delaware

[nmol/L, nanomoles per liter]

Site

GSCP5

GSCP6D

GSCP9S

MW19

MW37S

MW39S

MW61S

MW206M

MW226M

MW227D

DM102D

DM108D

DM109D

DM110S

DM113D

Number

Median

Maximum

Minimum

Sample 

concentration 

(nmol/L)

1.1

5.6

3

3.5

1.3

2.2

2.7

3.7

.36

.79

1.1

1.3

21.4

.73

7.1

15

2.2

21.4

.36

Duplicate 

concentration 

(nmol/L)

0.92

5.4

2.6

3.4

1.4

2.6

2.8

3.9

.3

1

.76

1.4

21

.69

8.5

15

2.6

21

.3

Relative 

percent 

difference

17.8

3.6

14.3

2.9

7.4

16.7

3.6

5.3

18.2

23.5

36.6

7.4

1.9

5.6

17.9

_

7.4

36.6

1.9

80
APPENDIX

Geophysical logs at the natural-attenuation study area, 

Dover Air Force Base, Kent County, Delaware, for wells:

Page

DM101D and DM102D ................................................................................. 82

DM104D and DM105D.................................................................................. 83

DM107D and DM109D................................................................................. 84

DM110D and DM113D................................................................................. 85

DM117D and DM118D................................................................................. 86

MW10 and MW11......................................................................................... 87

MW12 and MW19 ......................................................................................... 88

MW20 and MW37D ..................................................................................... 89

MW39D and MW40D ................................................................................... 90

MW42P and MW43D.................................................................................... 91

MW44D and MW61S.................................................................................... 92

MW62D and MW206D ................................................................................. 93

MW207D and MW226D ............................................................................... 94

MW227D ...................................................................................................... 95

(NGamma = Natural gamma log; Conduct = Electro-magnetic conductivity log; 

CPS = counts per second; mS/m = millisiemens per meter; 0 = curve of Conduct 

log in that area is affected by metal near the well casing, not lithologic or water-quality 

changes)

81
u

td 

CQ

td 

Uatd 

Q

x 0 CPS 100

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells DM 101D and DM102D.

82
u

oo 

Q

w

PQ

W

UH

ffi

eu 

w 

Q

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells DM104D and DM105D.

83
Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells DM107Dand DM109D.

84
W

u

w 

ca

H 

w 

w ua:

H Cu 

DJ 

Q

Well DM11 3D 

NGorrmo

0 CPS 100

 * K- Conduct

rrS/m 20

-*

O -__

ro 

CD

u CD

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells DMllODand DM113D.

85
U

CQ 

H

Well DM11 7D 

NGomma Conduct

0 CPS 110 mS/m 25

. o ..._

ho 

- o

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells DM117D and DM118D.

86
oo 

Q

O

J 

W 

CQ

tu

£

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MWlOand MW11.

87
D

00

Q

OQ

cu

uu

a

Well MW19

NGorrma

0 CPS 130 -a K- Conduct

0 rrS/m 20

. o _.,.

NO

o

h CD

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MW12 and MW19.
cu

oo 

Q

CU

CO

H 

CU 

CD 

tu

Ctu 

Q

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MW20 and MW37D.
w

CQ 

H

H Cu

Well MW40D 

 NGonma

CPS 100 -* K- Conduct

rrS/m

. o . _._.

- o -

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MW39D and MW40D.

90
tLJ

u

£

c*

D 

oo

Q

hu5f\ TH

Q

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MW42P and MW43D.
u

oo 

D

CQ

Well MW61 S 

__ NGonmo

CPS 100 -51 K- Conduct

ro

rrS/m 20

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MW44D and MW61S.
w 

u

O

 J

w

PQ

PH

Q

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MW62D and MW206D.

93
w 

u

Q

O

W 

CQ

PU

Q

Well MW226D 

NGamrra

0 CPS 100 3 fr Conduct

0 mS/m 20

ro 

o

OJ

Cn 

CD

- CD

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for wells MW207D and MW226D.
CJ

oo 

Q

O

OQ

Cu 

W 

Q

Geophysical logs at the natural-attenuation study area, Dover Air Force Base, 

Kent County, Delaware, for well MW227D.